Hirmand governor Soltan-Ali Dehmordeh said that 35 villages around the city had also been cut off by sand drifts and 30 homes had been buried.
The governor of Zahak also said that 57 nearby villages were surrounded by sand.
Sandstorm and wind dust have long been a problem in the province of Sistan and Balouchestan. But government officials have so far not taken any preventive measures in to save homes and lives of people against natural disaster.
Last month, severe flooding and torrential rain hit five provinces across Iran, including Sistan and Balouchestan.
A ten-year-old girl, a five-year-old boy and a man aged 45 were among those who died in Kerman province, while three more people lost their lives when their car crashed from a bridge into a river in Sistan-Baluchestan province.