He was arrested from his ancestral house at Sidhai late last night, West district Superintendent of Police Abhijit Saptarshi told reporters.
Debbarma, who was pushed back from Bangladesh four years ago, allegedly delivered a seditious statement at a public meeting last week at Teliamura in Khowai district, SP Krishnendu Chakraborty said.
He also attempted to form a new insurgent outfit with surrendered insurgents of ATTF and National Liberation Front of Tripura (NLFT), Chakraborty alleged.
A Khowai court remanded Debbarma to police custody for four days.
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