She was born as Juana Sujovolsky to an Argentine Jewish family in Buenos Aires and spent some of childhood in Brazil and Germany.
She studied with the renowned Max Reinhardt and Ilka Grüning, and was the companion and friend of actress Lilli Palmer.
She was forced to flee to England after the rise of Nazism and returned to Argentina where she debuted in Enrique Susini's theater company with Lola Membrives.
In April 1949 Sujo moved to Venezuela to star in the Bolívar Films movie El demonio es un ángel.
An opponent of the repressive regime of Venezuelan President Marcos Pérez Jiménez, she was credited with sparking the popular uprising that led to his removal from power.