The poacher had entered the sanctuary last night near a forest camp where he faced forest guards and fired at them in a bid to escape.
The forest guards retaliated and in the ensuing encounter, the poacher was killed, the official said.
A rifle and 14 rounds of ammunition were recovered from the spot.
The body of the poacher has been sent for postmortem examination, the official added.
Disclaimer: No Business Standard Journalist was involved in creation of this content