Q, "Sand Bay Gal" is actually "Sound Bay Gal" (sorry!) and comes from San Andres, an island that is part of Nicaragua, with community of English speaking Afro-Caribbean immigrants. Here are the lyrics, from the liner notes of the Smithsonian Folkways album "Caribbean Rhythms":

SOUND BAY GAL

CHORUS: All day, all night Mary Ann,
Sittin' by the roadside diggin' sand;
All day, all night Mary Ann,
Sittin' by the roadside diggin' sand.

Verse:
Sound Bay gal don't eat good food they buy their codfish,
Sound Bay gal don't eat good food they buy their codfish,
Sound Bay gal don't eat good food they buy their codfish.