After the end of the war Charles Van Antwerpen represented Belgium at several international rowing competitions in the late 1940s and early 1950s. Van Antwerpen had his best results at the European Rowing Championships, winning silver and bronze in the coxless pairs in 1949 and 1950, respectively. The following year he was part of the crew that won gold in the coxless fours at the championships in Mâcon, France. Either side of his success at the European Championships, Van Antwerpen also competed at the Olympics in London and Oslo, reaching the semi-final repêchage in the coxless fours at the latter.