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Born in Goulburn, New South Wales, Poidevin played rugby at St Patrick's College (now Trinity Catholic College) in New South Wales, and made the Australian Schoolboy side. Upon finishing school he played a season with the Goulburn Rugby Union Football Club and then, in 1978, he moved to Sydney to study at the University of New South Wales, from which he graduated in 1983 with a Bachelor of Science (Hons). He made his first grade debut with the university's rugby union team in 1978. In 1982 he moved clubs to Randwick, the famous Galloping Greens, home of the Ella brothers and many other Wallabies.

Poidevin continued to play for New South Wales in 1982, and travelled to New Zealand for a three-match tour with the team now coached by former Wallaby Peter Crittle and containing a new manager - future Australian coach Alan Jones. New South Wales won their first match against Waikato 43-21, their second match against Taranaki 14-9, and their third and final match against Manawatu 40-13.  Following the tour to New Zealand, Sydney played in a match against a World XV. However, because several European players withdrew, the World XV's forward pack was composed mainly of New Zealand forwards, including Graham Mourie, Andy Haden, Billy Bush and Hika Reid. Sydney won the game 31-13 with several of its players sustaining injuries. Poidevin was severely rucked across the forehead in the game and required several stitches to conceal the wound he sustained. All Black Andy Haden was later confronted by Poidevin at the post-match reception, where he denied culpability. Poidevin would later write that, "All evidence then seemed to point to [Billy] Bush, who was the other prime suspect. But years later Mourie told me that he had been shocked at the incident and, being captain, he spoken to Haden about it at the time. Haden's response? He accused the captain of getting soft." Public calls were made for an injury into the incident, with NSW Manager Alan Jones a prominent advocate for Poidevin. However, no action was taken. Poidevin would later write that with examination of videos and judiciary committees "the culprit(s) concerned would have spent a very long time out of the game."  Following NSW's game against the World XV, the team was set to play two interstate games against Queensland - both scheduled to be played in Queensland to celebrate the Queensland Rugby Union's centenary year.  Queensland won the first game 23-16.  Following an injury to New South Wales captain Mark Ella in the first game, Poidevin was made captain of the team for the first time in his career for the second game, lost 7-41 to Queensland.  Following the interstate series against Queensland, the Scotland national rugby union team toured Australia for the 1982 Scotland rugby union tour of Australia, which included two Tests. With eightman Mark Loane likely to be selected for the Australian team, Poidevin was faced with strong competition for the remaining two backrow positions at breakaway, with Tony Shaw, Gary Pearse, Peter Lucas and Chris Roche, all vying for national selection.  Prior to New South Wales' provincial game against Scotland, a newspaper headline read "Poidevin Needs a Blinder". Scotland defeated New South Wales 31-7, and Poidevin missed-out on national selection, with newly appointed Australian coach Bob Dwyer selecting Queenslanders Chris Roche and Tony Shaw for the remaining backrow positions. This was the first time Poidevin was dropped from the Australia national rugby union team.
Simon Poidevin