6 year old licking hands

by Chedva
(NY)

My 6 year old son was diagnosed with SID at the age of 3. We have been in OT since and he is now considered a boarderline case. He recently started licking his fingers. He is the type of kid that couldn't tolerate anything in his mouth (including food) when we started. When I asked him why he was doing it, he said he liked the feel on his hands and in his mouth. What ideas are there out there to redirect him?