IIFQ concluded Wednesday with the announcement of the awards, leaving Singh in a celebratory mood.
"Irrfan Khan is with me in Geneva at the moment. We're celebrating and look forward to celebrating with the 'Qissa' team soon," Singh posted on his Facebook page Thursday.
The Punjabi movie, about a girl raised as a boy, also won the best cinematography award for Sebastian Edschmid.
"Qissa" has been screened at various movie galas including Toronto International Film Festival, Mumbai Film Festival, Abu Dhabi International Film Festival, International Film Festival Rotterdam and Curacao International Film Festival.
It is now being screened at the Munich International Film Festival in Germany and is scheduled to release in the country on July 10. It will be showcased in the dubbed version and also in the original version with English subtitles in select theatres.
The hard-hitting drama is likely to release in India in September.