Goueslard entered competitive motorsport in 1990, racing in the Championnat de France Formule Renault, where his best season result was eleventh place in 1993. He made his 24 Hours of Le Mans debut in 1994, sharing an Elf Haberthur Racing Porsche 911 Turbo with Olivier Haberthur and Patrick Vuillaume, but a turbocharger failure ended their race. That season he also competed in the Porsche Carrera Cup France, finishing fifth in Class B. He remained in the Carrera Cup for two further seasons, claiming Class B honours in 1995 before finishing fourth overall in 1996, the year he also joined Larbre Competition in the BPR Global GT Series and finished 20th overall at Le Mans in a GT2-class Porsche 911 GT2.
In 1997, Goueslard took the French GT Championship title at his first serious attempt, partnering Christophe Bouchut with ten victories. The season also included a 24 Hours of Le Mans appearance in a Porsche 911 GT1, finishing fifth overall and third in the GT1 class. He retained strong form in subsequent years, adding French GT titles in 2002 — with four victories driving for Nourry Team Competition — and 2003, making him a three-time champion in the series.
He also secured the N-GT class title in the 2000 FIA GT Championship, registering six wins in Larbre Competition's Porsche 911 GT3-R across ten rounds.
From 2006, Goueslard's primary focus shifted to the Le Mans Series, driving GT1 cars for Luc Alphand Aventures. The partnership proved extremely productive:
2007: Third in the Le Mans Series GT1 standings, with one victory; also third in class at Le Mans.
2008: Won the GT1 category of the Le Mans Series with two victories from five races.
2009: Retained the GT1 LMS title with two further victories.
2010: Dominated the GT1 category with four wins from five rounds, driving a Saleen S7-R, claiming a third consecutive LMS GT1 crown for Luc Alphand Aventures.
Goueslard's best result at the 24 Hours of Le Mans came in 2006, when he joined Luc Alphand and Jérôme Policand in the Luc Alphand Aventures Chevrolet Corvette C5-R to finish seventh overall and third in the GT1 class. He repeated the third-in-class result in 2007. Retirement struck in 2009 after 99 laps due to an accident, and again in 2010 after 238 laps.
He first competed at Le Mans in 1994 and returned every year from 1999 through 2010, accumulating one of the most consistent attendance records among French GT drivers of his generation.
After leaving Luc Alphand Aventures in 2011, Goueslard moved briefly to the Euro-Racecar NASCAR Touring Series before joining the new Blancpain Endurance Series with Team SOFREV ASP in a Ferrari 458 Italia. He returned to form in the Blancpain Endurance Series in 2013, winning the Gentleman Trophy category with three victories from five races. In an interview during this period, he expressed a preference for the GT1 machinery of his Le Mans Series years and a desire to continue in GT racing.
Goueslard's career encapsulates the French GT endurance tradition of the 2000s — a world of Corvettes, Porsches, and Le Mans Series sprint-endurance racing that formed the backbone of European GT competition before the proliferation of GT3 championships. His three French GT Championship titles and three consecutive Le Mans Series GT1 crowns represent a remarkable record of class-level consistency, while his twelve consecutive starts at the 24 Hours of Le Mans between 1999 and 2010 speak to his longevity and professionalism in one of the sport's most demanding events.