Soviet authorities have threatened further sanctions against both dissident physicist Andrel Sakharov and his wife following public comments he made through her after his banishment two weeks ago, it was revealed here yesterday.

But the 58-year-old Nobel Peace Prize-winner nonetheless affirmed in a new statement that he will "refuse to submit" to what he characterized as an illegal deprivation of his civil and political rights.

The latest Sakharov statement was dated Sunday and was read to Western reporters by his wife, Elena Bonner, in the couple's former Moscow home yesterday afternoon. Bonner had spent the weekend with her husband in the Volga River city of Gorki to which he was banished.

According to his latest statement, Sakharov was summoned last Wednesday to the office of a Mr. Perelygin, deputy prosecutor for Gorki Province.

Perelygin told Sakharov that he had violated the terms of his exile by making a public statement on Jan. 23 blaming the Soviet Union for the deterioration in the international climate and saying his criticism of the Soviet invasion of Afghanistan was a cause of his banishment.

Further violations, Sakharov quoted the prosecutor as saying, would result in changes in the conditions of his exile and "sanctions . . . against my wife."