The US Treasury named Lt General Thein Htay, the head of Myanmar's Directorate of Defence Industries, for the sanctions, saying he was involved in buying North Korean military goods despite his government's support of the Security Council ban.
It also said he acted on behalf of the Directorate of Defense Industries, which was already on the US sanctions blacklist for arms deals with North Korea.
"This action specifically targets Thein Htay, who is involved in the illicit trade of North Korean arms to Burma," the US Treasury said in a statement, using the former official name for Myanmar.
The sanctions forbid any American from doing business with Thein Htay and freeze any assets he might have in the United States.