Alexander Vershbow told a forum in Seoul that U.S. Treasury Department officials most likely would make the visit Jan. 22, The Korea Times reported.
Vershbow said the officials also would visit Macau, where the Banco Delta Asia has been accused of helping Pyongyang launder money.
The United States has blacklisted eight North Korean companies that had accounts with the bank, accusing them of illegal activities including weapons trafficking.
The U.S. officials are expected to show South Korean officials the evidence behind the allegations.
North Korea has denied any illegal activities and claims there is no evidence to support the U.S. charges.