[PHI 3000] Where is my mind?

In the philosophy of mind, a dualist is someone who thinks that the mind (or the mental) and the body (or the physical) are radically different kinds of thing. A substance dualist is someone who thinks that the mind is that which thinks, an immaterial substance over and above its immaterial states.

Now, how would a substance dualist answer the following question: Where is my mind?

If this question makes sense, then it seems that the substance dualist would have a hard time answering it. After all, if the mind is an immaterial substance, then it cannot be anywhere, since an immaterial substance does not occupy space. Is this a problem for substance dualism?