"Congrats and welcome to new leadership in Sri Lanka. Congrats to people for peaceful n fair elections," BJP general secretary Ram Madhav tweeted.
The BJP leader also retweeted Prime Minister Narendra Modi's commitment to India's continued support for peace and development of Sri Lanka.
"I spoke to Shri Maithripala Sirisena & congratulated him. I congratulate the people of Sri Lanka on the peaceful & democratic poll process," Modi said in a tweet.
"As a close friend & neighbour, reaffirmed India's continued solidarity & support for Sri Lanka's peace, development & prosperity," the PM added.
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"The triumph of democracy is always a positive sign because it reflects the changing mood of people and relations between the best of neighbours like India and Sri Lanka will always take a strong step forward when spurred by the will of people," he told PTI.
"A new government in Colombo will also mark a fresh turn in our age-old relationship," Akbar said.
Sirisena defeated Mahinda Rajapaksa in the Presidential elections held yesterday in Sri Lanka.