Ettridge has served in a variety of men and women's coaching positions for Australia's national wheelchair basketball program. He served as the head coach of the Australian men's Under 23 team, an assistant with the women's national senior team and as head coach of the men's senior team. He became the head coach of the men's senior team in 2007 and guided them to gold at the Arafura Games. From 2007, the Rollers won 5 consecutive AOZ Championships, compiling a 45 wins and no loss record.
In 2010, the Rollers went undefeated at the World Cup in Birmingham, including a second-half 19-point comeback win against the USA in the semi-finals. In 2014, the Rollers completed a similar feat in Incheon, prevailing over the USA in the gold medal match.
In 2004, Ettridge became the head coach of the National Wheelchair Basketball League's Perth Wheelcats. His father, Len Ettridge, served as the team's assistant coach. In his second year as head coach, he took the team to the NWBL's championship final, where they lost to the West Sydney Razorbacks. In 2006, the Wheelcats lost only one game all season before going on to win the league championship. In 2007, he guided the Wheelcats to back-to-back championships. He then coached the Wheelcats to victory at the World Champions Cup, in a tournament where they did not lose a single game. In 2008, he was again the Wheelcats coach and the team lost only one game during the regular season before winning the NWBL's championship once again. In 2009, the Wheelcats ran the table again, defeating the Sydney Wheelkings to secure theor fourth consecutive NWBL championship. In 2010, he left his coaching job with the Wheelcats to focus on the Rollers' World Cup campaign, a move that proved to be highly successful. His record during his time as a NWBL head coach was 118 wins and 11 losses.
State Basketball League
In 2011, Ettridge was appointed coach of the Wanneroo Wolves' MSBL team and went on to guide them to their first championship since 1993. Following the 2012 season, he stepped down as coach of the Wolves due to work commitments in Sydney. He returned to the Wolves for the 2015 season and guided them to another championship. After four straight grand final defeats between 2016 and 2019, Ettridge parted ways with the Wolves. In October 2019, Ettridge was appointed head coach of the East Perth Eagles men's team. However, he parted ways with East Perth in February 2020, prior to the start of the 2020 season.
