Zavang-e Sofla () is a village in Firuzeh Rural District of the Central District in Firuzeh County, Razavi Khorasan province, Iran.
At the time of the 2006 National Census, the village's population was 457 in 113 households, when it was in the former Takht-e Jolgeh District of Nishapur County. The following census in 2011 counted 362 people in 102 households, by which time the district had been separated from the county in the establishment of Takht-e Jolgeh County. The rural district was transferred to the new Central District. The 2016 census measured the population of the village as 334 people in 99 households.