|Date of birth||3 August 1980|
|Place of birth||Espoo, Finland|
|Height||1.81 m (5 ft 11 in)|
|2006–2007||ADO Den Haag||10||(0)|
|* Senior club appearances and goals counted for the domestic league only|
Roiha began his Veikkausliiga career in Finland with HJK Helsinki. He was the top scorer in Finland in 2001 with 22 goals. In September 2001 he scored twice for the club against Celtic in a UEFA Cup tie, which HJK eventually lost 3–2 on aggregate. Roiha has since also played for Utrecht and Zwolle in the Netherlands and for Cercle Brugge in Belgium. He joined ADO Den Haag on a free transfer from Cercle Brugge during the January 2006 transfer window playing his first Eredivisie match with them on 28 January 2007.
After a short stint with Hungarian club Újpest, the club released him because of an injury in January 2010, and a few days later he signed a two-year contract with HJK Helsinki. However, injuries kept him sidelined for most of the 2009 season and he was released by HJK at the end of the season. In 2010, Roiha joined newly promoted Allsvenskan club Åtvidabergs FF on a free transfer. The club, however, suffered relegation to Superettan and he left after the season. In the 2011 season, Roiha played for Finnish club KuPS. After the season, he decided to retire from football.
- Finland's score first.
|1.||2 February 2005||Nicosia, Cyprus||Cyprus||2–1||Win||Friendly|
|3.||17 October 2005||Skopje, Macedonia||Macedonia||3–0||Win||2006 World Cup qualification|
|4.||21 January 2006||Riyadh, Saudi Arabia||Saudi Arabia||1–1||Draw||Friendly|
- "Tactical Formation". Football-Lineups.com. Retrieved 5 February 2007.
- Thapper, Kenneth (12 November 2010). "ÅFF tvingas släppa minst tre spelare – Folkbladet". folkbladet.se (in Swedish).
- "Veikkausliiga.com: Paulus Roiha lopettaa uransa". Iltalehti (in Finnish). 24 November 2011.