S.C.
My six year old daughter has sensory processing disorder. She's on a varied "sensory diet" at home. She bounces on an underinflated exercise ball & a mini-trampoline, she swings (the best kind of swings for most of these kids are the kind where they can swing in all directions, not just back & forth), plays with Thera-putty (much like silly putty), slides, blows on things (bubbles, pin-wheels, straws), sucks/chews on things (water bottles, necklaces), plays with a cool-whip tub full of dried beans & tiny toys, and does heavy work (pushing/pulling heavy objects).
All these things help her calm herself & feed her nervous system. It's amazing how much change there is in her with just a month and a half of this kind of activity.
Good luck to you!