Think there are some from gocek. I know that Portland (i think, May be portaway) do courses around the fethiye area as I have seen them coming in to yacht classic jetty with groups, also because I am nosey I have earwigged at what's been going on and have been quite impressed by the instructors.
This is for RYA yacht based courses. If you wanted dinghy sailing then you are going to have to go further and maybe to a neilson holiday base.
There are also a number of sailing schools that operate yacht courses out of marmaris, again, I have come across a couple of the instructors with students and have generally been impressed by what I have seen.
Hope you get fixed up.
Lorraine