I'm wondering why this is a concern. If you think your child suffers from this disorder I would take him/her to a pediatrician. A good pediatrician can then decide if a neurologist is needed.
I knew of a child that was kept in his crib for most of the day and was rarely picked up or paid attention to. It was so bad that he had learned not to cry, that no one would come if he did so. He used to rock himself back and forth constantly and would sometimes bang his head against the wall.
Here are some of the symptoms of Sensory Integration Disorder:
An acute awareness of background noises
Fascination with lights, fans, water
Hand flapping/repetitive movements
Spinning items, taking things apart
Walking on tip-toe
Little awareness of pain or temperature
Coordination problems
Unusually high or low activity level
Difficulty with transitions (doesn't "go with the flow")
Self-Injury or aggression
Extremes of activity level (either hyperactive or under active).
Fearful in space (on the swings, seesaw or heights).
Striking out at someone who accidentally brushes by them.
Avoidance of physical contact with people and with certain "textures," such as sand, paste and finger paints.
The child may react strongly to stimuli on face, hands and feet.
A child may have a very short attention span and become easily distracted.
A strong dislike of certain grooming activities, such as brushing the teeth, washing the face, having the hair brushed or cut.
An unusual sensitivity to sounds and smells.
A child may refuse to wear certain clothes or insist on wearing long sleeves/pants so that the skin is not exposed.
Frequently adjusts clothing, pushing up sleeves and/or pant legs.

my son doesn't like to be around other people, does not like to be touched, panics when you change his shirt, taking it over his head, he gets terrified, panics if you put a blanket over his feet when he goes to sleep, runs into the tables and the wall, has violent temper tantrums where he hurts himself or anyone that touches him and tries to calm him down. he was a very good baby,loves to be by himself. i always try to engage him in activity, but he has a hard time with that. i don't know what i did, we have always picked him up when he cried, never ignored him. could it be that i am pushing the whole engaging in group activity? i started taking him and his sister to a group at church with other kids because they stay home with me during the day, so i just wanted to let them play with other kids. his sister is the complete opposite. if i try to kiss him goodnight, he freaks out also so we stopped that. i feel kind of lost in this situation.

It would help if I knew more information. Is he adopted? If so, at what age did he come to live with you? How old is he? How does he act toward his sister? But, rather than giving me these answers, I think you should take him to your pediatrician and tell him/her your concerns. I hope you get help for him as soon as possible.