The party said Sani, who had been on 11 months suspension, is getting a tougher punishment because he failed to show remorse.
The party placed Sani on indefinite suspension after his 11-month suspension elapsed on Tuesday, November 29.
According to the APC secretary in ward 6, Tudun Wada area of the state, Sani's earlier suspension was to enable the senator defend himself against the allegations levelled against him, but he failed to do so.
"As you are aware, your suspension from the party for a period of eleven months elapsed today, being Tuesday 29th November, 2016," a letter written to Sani by the party.
"The suspension, which was in line with the constitution of our great party, the All Progressives Congress (APC), was to enable you to defend yourself against illegalities committed by you against the party as well as breach of its constitution.
"We expected the period of your suspension to give you the grace of being remorseful, but you rather choose to play otherwise, and this made our party to be vulnerable to disunity, disharmony and further shattering the existing peace mechanism within our ward and the state at large.
"Therefore, in consideration of the constitutional provisions as contained in Article 21 (A) i, ii, iii, v, vi, and vii of the constitution of the All Progressives Congress (APC), you are hereby suspended indefinitely from active participation of APC activities.
"This is in conformity with article 21 (D) i-(F) which provides punishment for any erring member of the party.
"With this letter, you are hereby warned to abide by the party’s decision," the party said.
The senator was not immediately available for comments on the development.