He had grabbed the woman by her collar and dashed her head against the wall.
The harassed woman has not complained to Sri Lanka Cricket, fearing that she would lose her job.
Previously, Nuwan had threatened ‘A’ team’s head coach Romesh Kaluwitharana.
On a complaint by Kaluwitharana, Nuwan was replaced with Upul Chandana as fielding coach for the West Indies tour.
However, at the instigation of a national cricketer who had retired recently, Ruwan was reinstated.