Yes, Turks and Caicos is accessible by boat via several ferry routes and private charters.
From the United States: Ferries operate from Miami and Fort Lauderdale, Florida to Grand Turk and Providenciales. Journey time: 3-4 hours.
From the Dominican Republic: Ferries run from Punta Cana to Providenciales. Journey time: approximately 2 hours.
Numerous private boat charter companies offer day trips, fishing excursions, and transfers from nearby islands and countries.