Aizawl District and Sessions Court judge Lucy Lalrinthari, who had earlier rejected the bail plea, granted Singh interim bail for 60 days.
Singh's counsel told the court that he had sustained injuries during a battle and required to continuously take physiotherapy which was not possible inside the prison.
The commandant was arrested on May five after returning from leave for allegedly being one of the masterminds in the highway robbery of 52 smuggled gold bars worth Rs 14.5 crore on December 14 last year on the outskirts of Aizawal town by personnel of AR's 39th battalion.
One civilian and nine AR personnel are still in judicial custody at Aizawl district jail.