The 16-test first five-eighth says New Zealand Rugby's policy of not selecting overseas-based players is under threat, with the temptation of lucrative contracts in the northern hemisphere starting to force a change.
"I do think that things are starting to change and players are starting to wise up," Sopoaga told the Daily Mail.
"They realise that it's a business these days. When you've got it, you've got it, but when you don't, clubs aren't going to be afraid to cut you."
Sopoaga, who made his All Blacks debut in 2015, signed a three-year deal with Wasps in January, leaving his Highlanders team at the end of the Super Rugby season.
Sopoaga, 27, says players are starting to talk to each other about their experiences, and how they can benefit from what can be a "cut-throat business".
"For a lot of guys like myself, who come from big families, from low socio-economic backgrounds, the chance to change your family's life is pretty overwhelming.
"Sometimes the jersey is not enough for a better life."