His wife Farah Osuli announced his death, adding that Sinai died due to lung infection caused by the coronavirus, IRNA reported.
Sinai had an operation in the hospital last month and was released.
Born in 1941, Sinai moved to Austria where he studied several fields including architecture, music composition, film and television directing as well as screenplay writing.
Sinai’s filmography consists of several shorts, features and documentaries. He began his cinematic career in 1967.
‘Bride of Fire,’ his first feature film, was made in 1999 and received the Best Screenplay award at the 18th Fajr Film Festival.
Sinai made several documentaries, including ‘The Melody Which an Antique Hears,’ ‘Beyond the Clamor,’ ‘The Coldness of Iron,’ ‘In the Alleys of Love,’ and ‘Hossein Yavari’.
One of Sinai’s last documentaries was ‘Rainbow Island,’ which was made in 2014 with a focus on Hormuz Island and its colorful soil. He did not consider this film a tourist work, but believed that the film reminds Iranians of the beauty of their country while everything is concentrated only on Iran’s capital Tehran.
In 2008, Sinai was awarded the Knight’s Cross of the Order of Merit of the Republic of Poland for ‘The Lost Requiem’ (1970-1983), his documentary that tells the story of the wartime exodus to Iran by thousands of Polish citizens after being released from the Soviet labor camps of Siberia during World War II.
A number of Polish citizens took refuge in the central Iranian city of Isfahan during World War II.