What type of degree is need to be an Art Therapist?

I have a degree in Art Education and I am trying to find out what I would need to get a job in the field of art therapy. I f you already have somekind of art degree, is there maybe a add on program or something?? Or will I need to completely start over?

i know an art therapist; i think you have to have a degree in social work or be a LISW (licensed independent social worker) so you can counsel people. find an art therapist and ask him or her!