Liao, who was HSBC's head of global banking for Asia Pacific, and Rosha, who was CEO of HSBC India, will continue to run the region as a single entity and be based in Hong Kong.
Wong has been CEO of Asia Pacific since February 2010. Last year he sparked a backlash from the British and U.S. governments when he signed a petition backing China's imposition of a national security law on Hong Kong, breaking years of neutrality for the UK-based, Asia-focused lender.
Wong is to become non-executive chairman of HSBC Asia Pacific, replacing Laura Cha.
(Reporting by Rachel Armstrong, Editing by Himani Sarkar)