Dewan was appointed the deputy minister of Chittagong Hill Tracts Affairs in the 2001 to 2006 Bangladesh Nationalist Party government.[11] In 2003, he threatened to resign from the government alleging he was being ignored, there was corruption, and issues in the Chittagong Hill Tracts were not being resolved.[12] In 2004, the government restricted the usage of ministry funds by him to 25 percent of the allocated fund.[13] He called for the recognition of ethnic minority in the constitution of Bangladesh in 2006.[8] He tried to introduce bus services in his constituency but failed due to opposition from the Rangamati District Auto-rickshaw Sramik Union.[14] He inaugurated a solar power plant in Rangamati in 2006.[15] As member of parliament he received a plot of land in Dhaka from RAJUK.[16]
^"Jamaat-e-Islami Bangladesh Makes Way to Khaleda's Cabinet". Xinhua News Agency. 10 October 2001. Retrieved 15 March 2023. Two out of six members of the minority community elected in the eighth parliament also made their way into the cabinet ... Moni swapan dewan, a buddhist from Southeastern Chittagong Hill Tracts was inducted as deputy minister