American Samoa, Fiji, Guam, Tahiti and Vanuatu have also lodged their interest with the Pacific Games Council (PGC).
The declaration of interest from Tonga is one of the most eye-catching of the potential contenders.
The kingdom was awarded the 2019 Pacific Games back in 2012, having seen off competition from Tahiti.
Tonga's Government withdrew from hosting the Games in 2017, citing financial concerns as the motive for the decision.
It led to the PGC reopening the bid process and selecting Samoa as replacement hosts in December 2017.