how bad/deep is the tear? can you post a photo of it?

clean it with chlorhexadine or betadine and put some triple antibiotic ointment on it. if you happen to have any silvadene cream that would be even better. keep him on papertowels or newspaper for now to avoid infection.

if this is anything more than a very minor injury you really need to take the snake to a vet to have it looked at.