Sega announced during its Sonic Boom event at Comic-Con International that the Dreamcast title will be reissued in HD for current generation machines.
Sonic Adventure 2 originally released on the Dreamcast in 2001 and introduced Sonic's rival, Shadow, while allowing players to go through both light and dark storylines.
Details of a re-release were leaked in June when a listing for the game surfaced on Xbox Live, before being pulled.
The original Sonic Adventure received the HD treatment for the same platforms in the autumn of 2010.
Sonic Adventure 2 is expected to be released for Xbox Live Arcade and PSN in October.
Watch a gameplay video from Sonic Adventure 2 below: