diff --git a/Assets/Scripts/BuildingManager.cs b/Assets/Scripts/BuildingManager.cs
index 1d48091..20f8778 100644
--- a/Assets/Scripts/BuildingManager.cs
+++ b/Assets/Scripts/BuildingManager.cs
@@ -185,7 +185,7 @@ namespace Northbound
         /// <summary>
         /// 건물 배치 요청 (클라이언트에서 호출)
         /// </summary>
-        public void RequestPlaceBuilding(int buildingIndex, Vector3 position, int rotation)
+        public void RequestPlaceBuilding(string buildingDataName, Vector3 position, int rotation)
         {
             if (!NetworkManager.Singleton.IsClient)
             {
@@ -194,11 +194,11 @@ namespace Northbound
             }
 
             ulong clientId = NetworkManager.Singleton.LocalClientId;
-            PlaceBuildingServerRpc(buildingIndex, position, rotation, clientId);
+            PlaceBuildingServerRpc(buildingDataName, position, rotation, clientId);
         }
 
         [Rpc(SendTo.Server, InvokePermission = RpcInvokePermission.Everyone)]
-        private void PlaceBuildingServerRpc(int buildingIndex, Vector3 position, int rotation, ulong requestingClientId)
+        private void PlaceBuildingServerRpc(string buildingDataName, Vector3 position, int rotation, ulong requestingClientId)
         {
             // 보안 검증 1: 유효한 클라이언트인지 확인
             if (!NetworkManager.Singleton.ConnectedClients.ContainsKey(requestingClientId))
@@ -206,17 +206,18 @@ namespace Northbound
                 return;
             }
 
-            // 보안 검증 2: 건물 인덱스 유효성 확인
-            if (buildingIndex < 0 || buildingIndex >= availableBuildings.Count)
+            // 보안 검증 2: 건물 데이터 찾기 (이름으로 검색)
+            TowerData data = availableBuildings.Find(b => b != null && b.name == buildingDataName);
+            if (data == null)
             {
+                Debug.LogWarning($"[BuildingManager] 건물 데이터를 찾을 수 없습니다: {buildingDataName}");
                 return;
             }
 
-            TowerData data = availableBuildings[buildingIndex];
-
-            // 보안 검증 3: 건물 데이터 유효성 확인
-            if (data == null || data.prefab == null)
+            // 보안 검증 3: 프리팹 확인
+            if (data.prefab == null)
             {
+                Debug.LogWarning($"[BuildingManager] 건물 프리팹이 없습니다: {buildingDataName}");
                 return;
             }
 
@@ -342,7 +343,7 @@ namespace Northbound
         /// <summary>
         /// 건물 토대 배치 요청 (클라이언트에서 호출)
         /// </summary>
-        public void RequestPlaceFoundation(int buildingIndex, Vector3 position, int rotation)
+        public void RequestPlaceFoundation(string buildingDataName, Vector3 position, int rotation)
         {
             if (!NetworkManager.Singleton.IsClient)
             {
@@ -351,11 +352,11 @@ namespace Northbound
             }
 
             ulong clientId = NetworkManager.Singleton.LocalClientId;
-            PlaceFoundationServerRpc(buildingIndex, position, rotation, clientId);
+            PlaceFoundationServerRpc(buildingDataName, position, rotation, clientId);
         }
 
         [Rpc(SendTo.Server, InvokePermission = RpcInvokePermission.Everyone)]
-        private void PlaceFoundationServerRpc(int buildingIndex, Vector3 position, int rotation, ulong requestingClientId)
+        private void PlaceFoundationServerRpc(string buildingDataName, Vector3 position, int rotation, ulong requestingClientId)
         {
             // 보안 검증 1: 유효한 클라이언트인지 확인
             if (!NetworkManager.Singleton.ConnectedClients.ContainsKey(requestingClientId))
@@ -363,17 +364,11 @@ namespace Northbound
                 return;
             }
 
-            // 보안 검증 2: 건물 인덱스 유효성 확인
-            if (buildingIndex < 0 || buildingIndex >= availableBuildings.Count)
-            {
-                return;
-            }
-
-            TowerData data = availableBuildings[buildingIndex];
-
-            // 보안 검증 3: 건물 데이터 유효성 확인
+            // 보안 검증 2: 건물 데이터 찾기 (이름으로 검색)
+            TowerData data = availableBuildings.Find(b => b != null && b.name == buildingDataName);
             if (data == null)
             {
+                Debug.LogWarning($"[BuildingManager] 건물 데이터를 찾을 수 없습니다: {buildingDataName}");
                 return;
             }
 
diff --git a/Assets/Scripts/BuildingPlacement.cs b/Assets/Scripts/BuildingPlacement.cs
index 24cb728..f2643c4 100644
--- a/Assets/Scripts/BuildingPlacement.cs
+++ b/Assets/Scripts/BuildingPlacement.cs
@@ -603,7 +603,7 @@ namespace Northbound
                             var coreResourceManager = CoreResourceManager.Instance;
                             if (coreResourceManager == null || coreResourceManager.CanAfford(selectedData.mana))
                             {
-                                BuildingManager.Instance.RequestPlaceFoundation(selectedBuildingIndex, groundPosition, currentRotation);
+                                BuildingManager.Instance.RequestPlaceFoundation(selectedData.name, groundPosition, currentRotation);
                             }
                         }
                     }
@@ -620,7 +620,7 @@ namespace Northbound
 
             foreach (var position in dragBuildingPositions)
             {
-                BuildingManager.Instance.RequestPlaceFoundation(selectedBuildingIndex, position, currentRotation);
+                BuildingManager.Instance.RequestPlaceFoundation(selectedData.name, position, currentRotation);
             }
         }
 
@@ -659,8 +659,8 @@ namespace Northbound
 
                 if (BuildingManager.Instance.IsValidPlacement(selectedData, hit.point, currentRotation, out Vector3 groundPosition))
                 {
-                    // 토대 배치 요청
-                    BuildingManager.Instance.RequestPlaceFoundation(selectedBuildingIndex, groundPosition, currentRotation);
+                    // 토대 배치 요청 (건물 이름 사용)
+                    BuildingManager.Instance.RequestPlaceFoundation(selectedData.name, groundPosition, currentRotation);
                 }
             }
         }