Star Trek director J.J. Abrams had recently suggested that the untitled follow-up could miss its planned June 2012 release date, but Pegg confirmed that the sci-fi movie is still on course to shoot this year.
Pegg told Digital Spy: "[Filming starts] this year, as far as I know. It's pretty much common knowledge that it's hopefully shooting in the autumn."
Asked about the secrecy that surrounds Abrams's projects, Pegg added: "Someone came and delivered the script [for the first Star Trek] and I read it in a hotel room... and then I had to give it back to the person who brought it so they could take it away. It's secretive, but we're trusted."
Pegg, whose latest film Paul is released on Blu-ray and DVD today, will reprise his role as Enterprise engineer Montgomery 'Scotty' Scott in the sequel. Chris Pine, Zachary Quinto, Zoe Saldana, Karl Urban, John Cho and Anton Yelchin are also expected to return.
> Simon Pegg, Nick Frost Paul video interview
Watch Simon Pegg discuss Star Trek below: