The Hoosier Gym in Knightstown, Indiana
The gym where they shot the movie still stands in all its glory. Looks the same as it did in the movie. You can go in there and shoot hoops, see the locker room, etc. I did it yesterday and it was an awesome experience. It's free too. For only $30 an hour, you can rent the gym out and have it to yourself.
Knighstown is located just off the I-70 about 30 miles east of Indianapolis.