Reuters reports, citing sources with knowledge of the matter

The incumbent official is Kenji Okamura, who will be stepping down next month after having served on the post for a year. He is reportedly set to be replaced by Japan MOF policy veteran, Masato Kanda, according to the report.

Just take note that Kanda has been a mainstay in Japanese policy as he had also regularly attended the BOJ meetings as a government representative in the past.