Not sure if you can travel to St. John?

The current CDC Order restricting international passengers arriving into the United States

DOES NOT APPLY traveling from the United States Virgin Islands.

 

Q&A (from CDC website).

Are territories or possessions of the US considered foreign countries for the purposes of this Order?

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No, the Order to present a documentation of a negative COVID-19 test or recovery from COVID-19 does not apply to air passengers flying from a US territory or possession to a US state.

US territories and possessions of the US include American Samoa, Guam, the Northern Mariana Islands, the Commonwealth of Puerto Rico, and the US Virgin Islands.