I have lived and worked in Barbados for over 2 years.
Not the most ideal place to learn to sail for reasons as mentioned above.
Also there is no real protected harbor there other than an artificial one created for the cruise
You might try the Yacht Club and get on a crew list. I am not aware of any actual sailing schools but then again I was there a long time ago.
We would sail to the Grenadines for an overnight passage
then work our way up to Martinique
so the return passage
would be a close reach (most of the time).
I would suggest checking out the Virgins for sailing schools on your next vacation
or simply charter
with a captain
to see if you really get the itch.
Otherwise Barbados is a very geographically diversified island and quite beautiful so enjoy.