Not sure if this particular page is new (it certainly is to me), but here is a handy list of all current (and recent) United Nations Security Council Sanctions Committees, broken down by geographic region.
It’s a lot nicer-looking than the site I was using, where you had to go through a long drop-down menu to get where you wanted to go… actually, I just noticed that this site has that drop-down, too. In fact, if you want to get to the sanctions materials, you still have to use the drop-down. This appears to be just the latest version of the old site… still like the list, though…