After retiring from football in 2017, Arbeloa returned to Real Madrid in 2020 to coach the under-14 team. Two years later, he took over as manager of the under-19 team.
Castilla, the reserve team of Real Madrid, currently competes in Spain's third-tier league, Primera Federación. In the 2024/25 season, they finished sixth in the league, narrowly missing the promotion playoffs.