The experiment will focus on the bank-to-bank 'wholesale' lending market rather than everyday public transactions but will be the first time a digital euro and Swiss franc have been fully tested.
The eurozone is adapting to a "strong trend" towards the digitalisation of payments," said Bank of France Deputy Governor Sylvie Goulard.
A partnership between Accenture and the Digital Dollar Foundation, the Digital Dollar Project was created last year to promote research into a US central bank digital currency (CBDC).
CBDCs are the digital equivalent of banknotes and coins, giving holders a direct digital claim on the central bank and allowing them to make instant electronic payments.
If necessary, the central bank will launch a pilot programme that involves payment service providers and end users, BOJ Executive Director Shinichi Uchida said last month.
While the BOJ currently has no plan to issue CBDC, central banks must not wait idly until the need to roll out its own digital currency arises, he told a seminar.