diff --git a/assets/konva/app.js b/assets/konva/app.js
index 806ccfb..397a7da 100644
--- a/assets/konva/app.js
+++ b/assets/konva/app.js
@@ -188,6 +188,18 @@ roomsLayer.on('dragmove', (e) => {
   if (_dimRoom && _dimRoom.id === draggedRoom.id) {
     _showDimensions(_dimRoom, node.x(), node.y());
   }
+
+  // Move sensors belonging to this room so they keep their relative position.
+  const newRoomX = node.x() / PPM;
+  const newRoomY = node.y() / PPM;
+  sensors.forEach(s => {
+    if (s.room_id !== roomId || s.floor_x == null) return;
+    const sg = sensorsLayer.findOne(`#sensor-${s.id}`);
+    if (!sg) return;
+    sg.x((newRoomX + s.floor_x) * PPM);
+    sg.y((newRoomY + s.floor_y) * PPM);
+  });
+  sensorsLayer.batchDraw();
 });
 
 // ---------------------------------------------------------------------------
@@ -298,6 +310,18 @@ function _onRoomDragEnd(room, group) {
     });
   }
 
+  // Reposition sensor groups to reflect any normalization shift.
+  sensors.forEach(s => {
+    if (s.floor_x == null) return;
+    const r = rooms.find(r => r.id === s.room_id);
+    if (!r) return;
+    const sg = sensorsLayer.findOne(`#sensor-${s.id}`);
+    if (!sg) return;
+    sg.x((r.x + s.floor_x) * PPM);
+    sg.y((r.y + s.floor_y) * PPM);
+  });
+  sensorsLayer.batchDraw();
+
   // Keep dimensions visible at the final position after normalization.
   if (_dimRoom && _dimRoom.id === room.id) {
     _showDimensions(room, group.x(), group.y());