Investigation has pointed to the alleged involvement of B Sadham and A Mubarak, both based in Coimbatore in the right wing leader's murder, CB CID police said.
In an official release here, they said the duo had evaded them despite summons being served at their residences.
"They have not cooperated and did not appear for probe. For information about each one of these suspects, a reward of Rs two lakh will be given," the release added.
Sasikumar was hacked to death on September 22 last year in Coimbatore by suspected fundamentalists and following it incidents of violence were witnessed there.
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Auditor' V Ramesh, Diabetologist Dr V Arvind Reddy, K Murugan (all BJP), S Vellaiyappan, KP Suresh Kumar (both Hindu Munnani - an RSS affiliate) were among the leaders of Hindu outfits killed in recent years in Tamil Nadu.
Twenty nine year-old Syed Abuthahir was arrested last month by police for his alleged role in Sasikumar's murder.
Alleging that Tamil Nadu police had "failed" to nab the culprits, BJP national secretary H Raja had months ago urged the government to hand over Sasikumar case to CBI.