Cavern City Tours are behind the ambitious scheme which would see replicas of the Cavern being built in Adelaide, Sao Paolo, Rio, Marbella, Miami and New York. There has also been interest from Mexico and Argentina.
The new outlets would incorporate the name, images, logos and merchandise of Liverpool's original version of the Cavern.
Bill Heckle, chairman of Cavern City Tours, said: "We have started to put something together and things are developing quite positively at the moment.
"We went to Rio last week to look at the site which has been earmarked for the development there.
"The group behind the Rio plans are in Liverpool for talks this weekend and they are hoping to have the Rio Cavern open in six to nine months.
"We are also talking about bands from Liverpool going on tour to all of the new venues.
"This is a fantastic opportunity to spread the name of the Beatles and the Cavern around the world."