Wormull was born in Crawley, West Sussex, and played for the under-15 team at local club Three Bridges before beginning his football career as a schoolboy with Brighton & Hove Albion.

[7] The closest he came to first-team football in six years at the club was in the Intertoto Cup,[5][8] a competition in which Tottenham fielded extremely weak sides, including that which lost 8–0 to FC Cologne.

[9] Released by Tottenham at the end of the 1996–97 season, Wormull joined Second Division club Brentford on a free transfer, marking his debut in the Football League by missing the best chance of the match.

[16] BBC Sport's 2000–01 Football Conference preview said that Dover would miss him,[17] a view later echoed by then assistant manager Clive Walker, who described the 1999–2000 season as "a year when we had players like Simon Wormull, Joe Dunne and Dave Clarke in the team.

Manager Graham Westley rejected the request,[29] but in April 2004 his contract was cancelled by mutual consent, citing the player's injury record and his difficulties adjusting to the demands of full-time football.

[30] Home-town club Crawley Town's manager Francis Vines hoped to sign Wormull, describing him as a good all-round player who "can play in the middle or wide right and passes the ball well, as well as being useful with set-pieces.

[34] A back injury restricted his Hornchurch appearances, and he had not played for several weeks when, in November 2004, the owner's business collapsed, the players' pay cheques were stopped, and most of the squad left.

[33][34] Wormull returned home to join Crawley, on much reduced wages, but he failed his medical examination; the club initially offered him a short-term deal while he proved his fitness.

[35] He turned down offers of full-time football, preferring to stay near home and combine his playing role with running the club's new youth coaching scheme in local schools.

[45] Despite new Lewes manager Kevin Keehan's view that "if I could have had only one player I could keep from last season, it would be Simon"[46] being reflected in the club offering him better terms than did Eastbourne Borough,[47] Wormull, together with teammate Jean-Michel Sigere, joined their local rivals in June 2008.

[53] He did leave with a winners' medal, earned as an unused substitute in the Sussex Senior Cup final in May 2009, in which Eastbourne beat a Brighton & Hove Albion reserve team 1–0.

[57] He rejoined Lewes a few days later,[58] staying with them until December, when he joined Sussex County League side Three Bridges, preferring for family reasons to play for a club nearer his home.

The board's view was that "being involved in a relegation battle was extremely disappointing", and an experience that was "particularly difficult" in context of the club's hard work towards "creat[ing] a platform from which to start building again", and Wormull was dismissed at the end of the season.