During the 15-minute meeting, Sonowalthanked the Prime Minister for his support during the campaign of Assam Assembly elections, sources said.
Sonowal discussed with Modi about various aspects of the government formation in Assam, they said.
The Prime Minister extended his best wishes to Sonowal and assured him of central government's help to the new government in Assam, which is to be headed by him.
Sonowal last evening had met BJP President Amit Shah anddiscussed with him about the government formation too, sources said.
The 53-year-old Union sports minister, who was BJP's chief ministerial candidate, led the campaign in the Assembly polls in which the BJP-led alliance bagged 87 seats in the 126-member House.
Sonowal will take oath on May 24 which will be attended by the Prime Minister, the party chief, among others.