Meisha, If your son sees an Occupational Therapist ask them about Wilbarger therapy and the medical brushes that are used for desensitizing sensory tactile kids. It worked wonders with my kid when he was in 2nd grade. Although we don’t see an OT any more, I still use the brush every once and awhile now (and he is in 6th grade now!)

I would start by making sensory bins out of materials that he does like. If you notice that there are textures that he gravitates towards, make those into a bin. You can also use water and some of his usual toys just to get him used to the idea of playing in a sensory bin and gradually add more textures.

Thanks so much Vicky!