Kasegan-e Sofla (Persian: كاسگان سفلي, also Romanized as Kāsegān-e Soflá; also known as Kāsegān-e Pā’īn) is a village in Vardasht Rural District, in the Central District of Semirom County, Isfahan Province, Iran. At the 2006 census, its population was 203, in 38 families.