He got married to Bhavana on 12 October 2008 at Somwarpet, Kodagu.
Midfield maestro Arjun Halappa is the son of former East Bengal Hockey Club player B.K. Halappa,
He hails from Kodagu (Coorg) District, Karnataka. He joined the Centre of Excellence in 1998 and a year later played his first Senior Nationals at Hyderabad, and was picked among the 72 probables for a conditioning camp. He made his junior international debut in the Europe tour same year under coaches C.R. Kumar and Harendera. He posted eight goals in the 2000 Junior Asia Cup.
He made his international debut for the Men's National Team in March 2001 against Egypt in the Prime Minister's Gold Cup. Halappa represented India at the 2004 Summer Olympics, where India finished in seventh place. He is the only player capable of performing in the playmaker role currently in Indian Hockey. He represented India at the 2010 Commonwealth Games in New Delhi, where India finished in second place.