Sebescen was born in Ehingen. He started his career at Stuttgarter Kickers, where he played at a senior level from 1994, in the Regionalliga Süd, and from, in 1996 the 2. Bundesliga. In 1999, he transferred to Bundesliga side VfL Wolfsburg and then in 2001 to Bayer Leverkusen. With Bayer, Sebescen played in the 2002 UEFA Champions League Final, losing to Real Madrid. In 2003, he had to undergo several knee surgeries, due to problems caused by lyme disease. Having not been able to play for years, Sebescen announced his early retirement, aged 29, on 16 August 2005. He had played 72 times in the Bundesliga, scoring 13 times, and 52 times in the 2. Bundesliga, scoring 5 times.