Henry Speight has signed a new three-year deal with the ARU to keep him in Australia through to the end of 2018.
The Fijian-born winger will join the Australian Sevens programme in 2016 as they bid to reach reach the Rio 2016 Olympics.
The landmark deal means Speight will be available for the inaugural Sydney 7s at Allianz Stadium in February next year.
As part of the agreement between Australian Rugby and the Brumbies, Speight will combine his duties with the national Sevens programme and his Super Rugby team throughout 2016.
As well as the Sydney 7s on the weekend on February 6-7, Speight will be available for selection for the Hong Kong and London legs of the 2015/16 World Rugby Sevens Series and – pending qualification – the Rio 2016 Olympics.
At the conclusion of the Rio Olympics in August 2016, Speight will be available for the Wallabies for the remainder of the Rugby Championship before returning full-time with the Aquis Brumbies for the 2017 and 2018 Super Rugby seasons.
Henry Speight said: "I am grateful to both the ARU and the Brumbies for giving me the opportunity to continue playing for the Wallabies as well as having a chance to go to an Olympic Games. We still have to qualify for Rio, but I’m confident that we’ll get through and can push for a medal.
"Sevens is massive in Fiji where I grew up and I’ve always enjoyed playing it. It is an exciting time for the game in this country and I can’t wait to be a part of it.
"For now, my focus is on the Wallabies and making the squad for the World Cup."