Not sure if there are any CSA projects as such but you could get in touch with Fundación Agricultura y Medio Ambiente (FAMA) in the capital who do organic certification, support organic farmers and sell their produce for advice and contacts.
Contact Dra. Andrea Brechelt or Clara Fernandez
Calle Ana Josefa Puello No. 33
Mirador Sur, Santo Domingo
829-435-8190
mercado_ecologico@yahoo.com
fama@codetel.net.do