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document updated 13 years ago, on Dec 27, 2010
http://www.quackwatch.com/01QuackeryRelatedTopics/sid.html
(see the 'Sensory Integration Therapy' section) there's almost no scientific evidence that backs it up
Wikipedia lists numerous related pages under CAM (complementary alternative medicine) categories
Sensory defensiveness
Sensory integration therapy
Mayo Clicnic notes that sensory integration therapies are considered CAM
loooong writeup on the lack of evidence
(though it does end on an upnote — suggesting there may be a kernel of truth hidden among the misdirections, but, as usual, More Research Is Needed)