Simunsen, a centreman, was with Woodville from their inaugural SANFL season in 1964. For the previous five years he had played for the club in the SANFL 'B' competition as Woodville, along with Central District, where required to serve an apprenticeship before being admitted. He won two Reserves Magarey Medals, in 1961 and 1962, and was also runner up in the award twice.
When they joined the top flight in 1964, Simunsen was made captain and he won their 'Best and fairest' that year. He went on to win further 'Best and fairest' awards in 1965 and 1966, also finishing second in the 1966 Magarey Medal to Ron Kneebone. Simunsen represented South Australia at interstate football for the first time in 1965, against Victoria, and also appeared at the 1966 Hobart Carnival. Although he didn't continue on as Woodville captain after the initial season, Simunsen had another stint in 1971.
His four cricket matches came during the 1972/73 Sheffield Shield season where he played as a left-handed batsman, making 103 runs at 20.60. This included a half century on debut, against John Benaud's New South Wales at the Adelaide Oval. Simunsen, batting in the same side as the Chappell brothers and Pakistani Test cricketer Younis Ahmed, made 58 in his second innings before being bowled by Kerry O'Keeffe.[1]
Victoria (VFL) 16.23 (119) defeated South Australia 7.9 (51), at North Hobart Oval, 11 June 1966, crowd: 23,764 Western Australia 13.11 (89) defeated South Australia 10.14 (74), at North Hobart Oval, 13 June 1966, crowd: 13,969 South Australia 21.20 (146) defeated Victoria (VFA) 9.11 (65), at North Hobart Oval, 16 June 1966, crowd: 10,199 South Australia 14.7 (91) defeated Tasmania 9.13 (67), at North Hobart Oval, 18 June 1966, crowd: 23,368