Boxall was selected in the Australian National Team in 2001. Boxall competed in wheelchair rugby events in the United States, South Africa, Sweden and New Zealand and represented Australia in the 2002 and 2006World Championships and the 2004 Athens and 2008 Beijing Paralympic Games. He won a silver medal at the 2008 Beijing Games in the mixed wheelchair rugby event. He was on the Australian team that competed in the 2001 Oceania Zonal Championships that finished first. He was also part of the Australian national side that finished in third at the 2002 World Championships. He was also part of the 2002 team that competed at the World Rugby Challenge in Canada. In 2005, he was part of the Australian team that finished in second at the Oceania Zonal Championships. In 2007, he was part of the team that competed at the Oceania Wheelchair Rugby Championships. In 2008, he was part of the Australian team that finished first at the Rugby Super Series.