After the war, in 1946, most of the war-raised battalions of the 8th Punjab were deactivated except the 6th and 8th Battalions.[6]
Upon the independence of India and Pakistan in August 1947, the battalion was assigned to the Pakistan Army together with the rest of 8th Punjab and several other infantry regiments including the 10th Baluch Regiment and the Bahawalpur Regiment. Sikhs and Gujars in the battalion were exchanged with Muslims from units allocated to the Indian Army. In January 1948 the battalion was deactivated but was raised again in October 1948, in response to the Kashmir War with India.
In 1956, Pakistan merged the 8th Punjab with the 10th Baluch and the Bahawalpur Regiments to form the Baloch Regiment. The 6th Battalion was re-designated as 13th Battalion, Baloch Regiment.[6]
Since independence, the Pakistan Army had been dominated by Punjabis, with as much as 77% of army personnel being from that group.[7] A specific regiment was created to address concerns of underrepresentation of Sindhis.[8][9] This was done on 1 July 1980 by the transfer of eleven battalions from the Punjab Regiment and ten battalions from the Baloch Regiment.[10] The 13th Battalion, Baloch Regiment was re-designated as 1st Battalion, Sindh Regiment. After 1989 the proportion of Sindhis in the regiment was increased to over 50%.