While New Zealand has been put forward as a potential site for the ninth licence, Cummins believes Hong Kong and Singapore are better options.
"I think Hong Kong and Singapore are really good ideas because that's going to significantly grow the TV audience," Cummins told AAP.
"I'm not convinced on New Zealand. Having one team in New Zealand you're just going to end up playing the national team and it's not going to deliver a particularly big TV audience.
"Something like Hong Kong or Singapore would be a pretty bold move.
"But having said that, the Big Bash's primary objective remains to grow the game of cricket in Australia. The question that Cricket Australia would naturally ask would be: how does having a team in Hong Kong grow the game in Australia?"
While adding new teams appears to be off the table for the next two seasons, Cummins said that did not mean the competition could not grow before then.
He said he supported the addition of more fixtures, with each side's regular rounds to grow from eight to 10, as well as an expanded finals series.While Cummins said he expected that next season would be too soon to include more fixtures, he would like to see it happen for BBL07.
"Expansion of games rather than expansion of teams is the priority," Cummins said.
"Any talk of expansion needs to take the form of additional games rather than bringing in teams.
"The player depth is not the best and I'm not convinced that adding additional teams will increase the total broadcast reach."