The 15-year-old has penned a three-year deal at Villa Park and will initially become a part of the club's youth set-up.
Omerovic is an Austria Under-16s international despite having Bosnian roots and he can operate in a defensive midfield role.
The youngster says that playing English football will meet one of his all-time ambitions as he prepares for the move to the Midlands.
"It was always my dream to play in England," he told Laola1.at.
"The fact that I'm now going there is just sensational and gorgeous of course."