St. Thomas and San Juan are over 100 miles away. a boat trip would take hours. The only way there is to fly.
LBI2SXM is correct - no ferry between SXM and St. Thomas or San Juan -.
You could charter a boat for the trip but it's quite a distance and crosses a lot of open water - you'll need a very large (read expensive) boat and depending on the speed of the boat the trip will probably take between 10 and 15 hours by power boat (double that for a sail boat). Do this only if you are a very experienced "blue water" sailor.
The only islands you can reach by scheduled ferry service from SXM are Anguilla (a 20 minute trip) and St. Barts (a 45 to 60 minute trip).
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