Game director James Ohlen told Comic-Con attendees that it is "hoping" to see new worlds added to the massively-multiplayer online game for decades.
"Well, I can say that we have 19 major worlds. Then we have an indeterminate number of minor worlds," he said according to Darth Hater.
"And our goal - this being an online game that we're hoping is going to last for decades - we're going to be, obviously, adding more to the galaxy map as the game progresses."
He added: "We want to add dozens of worlds. Hundreds of worlds eventually. In 2025, we'll hopefully have 500 worlds."
BioWare has previously called Star Wars: The Old Republic a "gigantic game", with more than 200 hours of gameplay for each of its six classes.
The MMO has also been named as the most expensive project Electronic Arts has ever made.
Star Wars: The Old Republic will be released later this year alongside several Special Editions.
> Preview: Star Wars: The Old Republic
> Interview: BioWare's James Ohlen on Star Wars: The Old Republic
Watch Star Wars: The Old Republic's E3 2010 trailer below: