When I search 'Scottish' under specific skills on the 'find a teacher' page, I find three teachers:
https://www.italki.com/teachers/english?country=GB&is_native=1&teacher_type=0&q=scottish
I am sure there are more than that, but not all of them will have specifically tagged themselves as Scottish and italki hasn't made it too easy to narrow down the accent you want, unfortunately.  It would be a great feature!

Edit: actually, none of those three have tagged themselves as Scottish either, as far as I can see.  Italki might be making the call based on actual geographical location.  I have taken lessons with at least one other Scottish teacher who doesn't live in Scotland, and he doesn't come up in my search results (but he isn't looking for new students right now).