I finally found the official BVI government order banning foreign-based vessels from entering.

It is at https://eservices.gov.vg/gazette/si...t%20%28COVID-19%29%20Order%2C%202020.pdf.

Its entire text is appended below.

Until this order is revoked, pleasure boats based outside the BVI may not enter.

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Section
1. Citation and commencement.
2. Prohibition or restriction of commercial vessels or aircraft.








The Minister, acting in accordance with section 3 of the COVID-19 Control and Suppression (Miscellaneous Provisions) Act, 2020 (No. 5 of 2020), makes this Order:

1.(1) This Order may be cited as the Prohibition or restriction of commercial vessels or aircraft (COVID-19) Order, 2020.

(2) This Order shall come into force on the 8th day of April, 2020.

2. In accordance with section 3 of the COVID-19 Control and Suppression (Miscellaneous Provisions) Act, 2020 a ferry, pleasure boat [emphasis mine], commercial vessel, commercial airline, private aircraft or any other means of transportation at any port in the Territory is prohibited or restricted from entering the Territory, except as the Minister in exceptional circumstances may by direction in writing authorise.

Made by the Minister this 8th day of April, 2020.