Several condos have "heated" pools, although many are outdoors. Sterling Breeze would be a nice choice among these, although i'm not sure exactly what temperature they call "heated":)
Aqua & Celadon both have indoor/outdoor pools, meaning you can swim from inside to outside and I believe these are both heated.
As for a truly indoor heated pool, the one that comes to mind for me would be at Mejestic Beach Resort. Tidewater has a small one, although their hot tubs are quite large and indoor which is nice.
Of course, temps vary this time of the year, so it's hard to say how important indoor would be vs. outdoor....it really comes down to what the resort considers "heated". All of these places have hot tubs too...just in case:)
Have a great trip!