The fighter, known as Abu Muhammad al-Almani, was killed during his group's clashes with the Syrian troops at the al-Sina'a neighbourhood in the oil-rich province of Deir al-Zour, xinhua reported citing SANA news agency.
The report added that many other IS fighters, most of whom are foreigners, were also killed in the clashes.
In the town of Hwaijat Sakr in Deir al-Zour, a Syrian army unit killed undisclosed IS fighters, including Libyans, it said.
The Syrian troops also killed foreign rebels in the eastern countryside of the capital Damascus Saturday, including Jordanians, Tunisians and Egyptians, the report revealed.
Syrian troops continued Saturday its attacks against the positions of the "terrorist" groups across Syria.
The Syrian government has for long complained of the flow of foreign jihadis into Syria, accusing neighbouring countries of facilitating the flow of such radical fighters into the war-torn country.
Meanwhile, the oppositional Syrian Observatory for Human Rights said Saturday that the Syrian air force carried out around 533 air strikes against several Syrian cities in recent days.