Can a therapist specialize in a specific disorder or illness?

I want to be a therapist; the kind who talks with people about their problems and helps them overcome them, not the types who work with medicine, or a social worker.

Is it possible to specialize in a specific thing? I have Sensory Integration Disorder, and I really want to help others who have this, too. It's not widely known, and when I was a kid, someone who knew what I was going through.
It's not rare, just relatively newly-discovered.
 
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