Maloney will join the club in 2013 on a three-year deal.
A standout performer in 2011, Maloney, 25 and in the peak of his career, is widely regarded as one of the best competitors in the game and the Roosters believe that he will be a valuable asset to the club.
Sydney Roosters recruitment manager Peter O’Sullivan said: “2011 was a breakthrough year for James and we see him taking his game to the next level at the Roosters, forming a strong long-term partnership in the halves with Mitchell Pearce .”
Sydney Roosters Head Coach Brian Smith added: “James has a style of play that will complement the Roosters and has a high goal kicking percentage as well.
“He will be in his prime across the seasons he has signed with us and we look forward to welcoming James to the Roosters in 2013.”