After leaving the active sport, he served as the coach of the national volleyball team.
Between 1957 and 1967, Sinan Erdem served as the secretary general of the Turkish Volleyball Federation.
During the Olympic games in Seoul, Barcelona, Atlanta and in Sydney, he served as a member of the IOC.
Erdem's greatest ideal was that Turkey and Istanbul host once the Olympic Games.
Turkey's biggest sport arena Sinan Erdem Dome is named in his commemoration.