Director General of the International Weightlifting Federation, Attila Adamif says most of them plan to use the games as a qualifier for the Tokyo 2020 Olympics.
He recently visited Samoa to see the preparations for the games.
The additional events mean there will be "athletes coming all over from the world," Adamif said.
"I’m sure from Europe, Pan-American, Asia and hopefully Africa. So, it won’t be just a Pacific event, it will be a global event."
A total of 20 Pacific nations and territories, including both New Zealand and Australia, have indicated their participation in five days of competition, from 9-13 July.
Additionally, competitors from outside the Pacific Games family will be taking part.