There are a few sites out there that allow it, but it's against the site's policy for me to point you to them.
You can also play here as long as it's unrated and you and your opponent agree beforehand. There used to be (and likely still is) an advanced chess group, but it was never terribly active. You might start there....
Is there a website for computer assisted play?
Is there a group on chess.com where I can find opponents?