Saadat Qoli-ye Sofla () is a village in Yazdan Rural District of Quchan Atiq District in Quchan County, Razavi Khorasan province, Iran.
At the time of the 2006 National Census, the village's population was 151 in 37 households, when it was in Quchan Atiq Rural District of the Central District. The following census in 2011 counted 117 people in 33 households. The 2016 census measured the population of the village as 119 people in 34 households.
In 2020, the rural district was separated from the district in the establishment of Quchan Atiq District, and Saadat Qoli-ye Sofla was transferred to Yazdan Rural District created in the new district.