Stamatopoulos started his managerial career with German side SC West Köln. In 2003, he was appointed manager of German side SF Troisdorf. In 2008, he was appointed manager of Greek side Panionios FC. In 2010, he was appointed manager of Greek side Pontioi Katerini FC. In 2012, he was appointed manager of Greek side Tyrnavos 2005 FC. After that, he was appointed manager of Estonian side Tartu JK Tammeka. After that, he was appointed manager of Greek side Episkopi FC. In 2021, he was appointed manager of German side FC 08 Homburg. He starred in German television show "Fujuma".