RFL executive chairman Richard Lewis said: "It's terrific news about the Skolars and we're happy to have them on board."
Lewis added that the new club would receive special dispensation to exceed the overseas quota because of the high proportion of Antipodeans living in the capital. Non-Super League clubs are restricted to just one overseas player per club.
Under the league restructure, York City will also be admitted into the Premiership which will be split in two to form National Leagues One and Two. Below them in a pyramid structure, the new National League Three will comprise two divisions of amateur clubs.