Deputy Prime Minister Aleksandar Vucic, the powerful head of the SNS, said party leadership "unanimously" backed his proposal to call the polls, the Tanjug news agency reported.
"My proposal is to check the will of the people," Vucic told a party meeting yesterday, calling for the snap vote to be held on March 16.
"The time has come to give account of what we have done," Vucic said.
President Tomislav Nikolic is expected to dissolve parliament and call the polls by Wednesday, once he receives a formal government proposal, his office said.
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A December survey showed the SNS enjoys the support of about 43 per cent of voters, the Blic daily reported today.
Support for the country's second-largest party, the opposition Democratic Party (DS), stands at around 13 per cent, showed the survey.
Trailing is Prime Minister Ivica Dacic's Socialist Party of Serbia (SPS), a junior partner in the ruling coalition, with 11-per cent support.
Since taking power, the government has significantly improved relations with longtime foe Kosovo, signing an agreement last April on better ties with the breakaway province that paved the way for Serbia to start the negotiating process on EU membership earlier this week.
Serbia hopes to join the 28-member EU by 2020.
Vucic and Nikolic formed the pro-European SNS in 2008 after abandoning the ultra-nationalist Serbian Radical Party of Vojislav Seselj.
Seselj is on trial before the United Nations war crimes court for the former Yugoslavia in The Hague for his role in the Balkans wars in the 1990s.