Coghlan earned this latest award after showing her strength and commitment as captain of the Irish team, who are now hoping to round off the Six Nations in style - and make it a St. Patrick's Day to remember - by defeating Italy in Parabiago to complete a famous Grand Slam.
Commenting on her Six Nations success, Coghlan said: "Rugby has given me so many brilliant opportunities, so many wonderful experiences, I'd love more people to get that chance - if our success, and the exposure we're getting now, leads to more girls getting involved in the game, that would be the best thing of all."
The accolade of winning the Irish Times/Irish Sports Council 'Sportswoman of the Month' means Fiona will be the third of 12 sportswomen to be in the running for the prestigious title of 'Sportswoman of the Year' at an awards ceremony in December 2013.
Established in 2004, the aim of the Sportswoman of the Year awards is to recognise the abilities and achievements of women in Irish sports.
The awards run over a 12-month period, with the judges selecting a winner each month for her ability to excel at sport. From the twelve monthly winners, the overall Sportswoman of the Year is selected and announced in December.
The winner is decided by a judging panel, which is represented by individuals from the Irish Times, RTÉ and the Evening Herald.