 Tobias' international career began when he was selected for the Proteas' 1971 tour of Britain.The Proteas were affiliated with the Coloured South African Rugby Football Federation, one of four racially segregated rugby union associations in South Africa at the time.On 4 June 1974 Tobias scored the only points (a penalty and a drop-kick) at fly-half as the Springboks were beaten 6-37 by the touring Lions side at Goodwood Showground in Cape Town.