It said Modi had "belittled" himself by claiming that suspended Congress leader Mani Shankar Aiyar's remarks against him had insulted the pride of Gujarat.
"Modi has belittled himself. We consider Modi as pride of the country and Hindus, but he is now chained by the Gujarat asmita (pride)," the Sena said in an editorial in party mouthpiece 'Saamana'.
"In Gujarat elections, Modi is less of a national and more of a regional (leader)," it said.
Notably, during the first phase of polling in Gujarat on Saturday, the opposition leaders had expressed apprehensions over electronic voting machine (EVM) tampering, a charge rejected by the poll body.
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The Sena said the Gujarat poll campaign should have been focused on the much-touted 'development plank'.
"However, that point was missing from the prime minister's speeches in Gujarat," it said.
In his home state, the prime minister was sometimes emotional and sometimes aggressive in election speeches, the Sena said.
"This is the state which gave us this prime minister and where the BJP has ruled for 22 years. Why should BJP stoop to such a low level during election campaign?" it posed.
The editorial said the quality of election campaign has "declined" due to the BJP.
"When we mentioned Afzal Khan in Maharashtra Assembly elections, the BJP objected and said we had stooped to a low level in campaigning. However, Modi himself referred to the Mughal regime in the Gujarat poll campaign," it said.
In the 2014 Maharashtra poll campaign, the BJP had asked the Shiv Sena to apologise for describing its campaign leaders as "Afzal Khan ki aulaad" who were trying to conquer Maharashtra.
"It is said the BJP's victory in Gujarat has become easy due to Rahul Gandhi's elevation in Congress. If that is the case, why are the prime minister, BJP national president and all Union ministers and chief ministers of BJP-ruled states campaigning against him?" it asked.
"People in the country are puzzled over this," the Sena added.