I've been to Sandals in St. Lucia and, no, there really isn't anything on Tortola (or in the BVI, for that matter) that compares.
There are several resorts in the BVI -- Peter Island, Biras Creek, Little Dix -- that offer meal plans and generally offer a more "inclusive" experience. These properties are more secluded and many guests don't leave the property for the duration of their vacation but the feel is completely different from the all-inclusives you find in Jamaica or Cancun or Punta Cana.
Long Bay is the closest to a "resort" that you will find on Tortola but if you're looking for a Sandals type experience, I think you will be disappointed.
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