The kind of snorting you describe is both common and particularly challenging to manage. So while I hope my tips are helpful, I want to make clear that they’re no substitute for a personalized therapy program with your son working one-on-one with an occupational, speech or behavioral therapist.
Also please keep in mind that sensory-stimulating behaviors serve an important purpose. From your question, I see you understand the need to find a replacement behavior to meet your son’s sensory needs.
Here are some strategies that may help reduce the frequency and intensity of the snorting: