A "game-changing" submarine fibre optic cable that will emerge from the sea at Maroochydore will provide Australia’s fastest internet link to Asia and its second-fastest link to the US.

State Development Minister Cameron Dick and Sunshine Coast mayor Mark Jamieson announced on Friday that tech giant RTI Connectivity and the Sunshine Coast Council will build the 550-kilometre undersea cable into the Sunshine Coast by 2020.

The undersea fibre optic cable that would run into the Sunshine Coast, providing Australia's fastest telecommunications connection to Asia.

That spur runs from the 9600 kilometre long undersea cable from Sydney to Guam being built by Google, RTI Connectivity and AARNet.

The Sunshine Coast had pushed the project for four years because data traffic from Australia was expanding 40 per cent each year, Cr Jamieson said.