Wynyard was selected to be part of the
professional All Blacks 1907–08 tour of Australia and Great Britain. He was one of the last two players selected, along with
Charlie Dunning, and joined the squad late during the first Australian leg of the tour. Wynyard became a valuable member of the squad, scoring six tries, however injury meant he had to wait until the squad returned to Australia to make his test debut, playing in the
first ever trans-Tasman test which was the debut match of the
Australia national rugby league team. He played in two of the test matches against Australia. Unlike many of the touring party Wynyard opted not to return to a professional contract in Britain and instead stayed in New Zealand to help establish rugby league. He, along with his brother, helped found the North Shore Albions Rugby League Club – which broke away from the North Shore Rugby Club. He largely acted as a coach and selector for the North Shore club though he did come out of retirement to play a match for them in Round 7 of the 1913 season and scored a try in a 10–7 win.{{cite news ==Later years==