The Indora legislator was denied a ticket by the BJP in the 2012 state elections and after being expelled, he contested as an independent.
Dhimam made the announcement in the presence of Union Health Minister J P Nadda at the rally.
Nadda and other senior BJP leaders welcomed him back and said his "homecoming" would strengthen the party.
The BJP has a strength of 28 MLAs in the 68-member assembly and two out of the four independents have announced to join the party.
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