The 22-year-old youth was arrested for inadvertently crossing in the belt, a BSF officer said.
This is the second such case in R S Pura Sector in past two days.
On Saturday, Sahanulla (38), a resident of Wajid Wali village in Chawinda in Sialkot district of Pakistan, was arrested by the Border Security Force (BSF) when he crossed into the Indian side in Pindi area of the sector.