Little Bins for Little Hands has about fifty different sensory play activities. Note that their page has lots of ads so be careful where you click!
Hands on as We Grow has about 25. It also has a lot of ads on each page and popups
And Next Comes SL has sensory play ideas and other supports for students with Autism. Also has ads.
Go Noodle videos has a wide variety of movement and mindfulness activities for students