He was born in İstanbul in 26th of February 1923. He graduated secondary and high school from İstanbul Boys High School, and graduated from Decoration Department of the State Academy of Fine Arts as a student of Kenan Temizkan in 1947. He went to Paris for the training of Theatre Stage and Costume with a state scholarship which he acquired by taking a Europe-wide examination in 1948. He carried out art studies in the workshop André L’hote , Academie Grande Chaumiere, and Atelier de L’art Apstrait, and was trained for theatre stage and costume in the workshops Ecole du Louvre, Academie Julian and Paul Colin, and also started his sculpture studies in Paris until 1952. He returned to Turkey in 1952, and was appointed as a faculty member to the State Academy of Fine Arts. He founded the Department of Theatre Setting and Costume with Erdoğan Aksel in 1962. He was a faculty member and the head of the Department of Visual and Performing Arts in Mimar Sinan University until his retirement in 1990.He was a lecturer in the Department of Architecture during his retirement. Sadi Öziş founded the metal workshop Kare Metal with the sculptor İlhan Koman in 1953, and two artists started to produce metal furniture for the first time in Turkey. With Sadi Çalık joining Kare Metal in 1958, the workshop put their stamp in history as an agent in Turkey in the modern furniture sector with their metal furniture designs. İlhan Koman left Kare Metal in 1958, and Sadi Çalık left in 1959, so Sadi Öziş continued his studies in Kare Metal alone until 1967. Öziş also continued his sculpture studies in this workshop, and he aroused great interest with his creations of sculpture-furniture both in Turkish and European media. Sadi Öziş founded Galeri-T which is one of the leading decoration offices in Turkey, with Gevher Bozkurt in 1962. He continued working until 1967. He joined several exhibitions in Turkey and abroad with his sculptures and paintings. He also made the entrance relieves of Anıtkabir on the scale of 1:1 with sculptors Hadi Bara, Zühtü Müritoğlu, Şadi Çalık, and İlhan Koman. He was awarded second place in 1963 and in 1970, and first in 1971 in State Painting and Sculpture exhibitions.