Louw was born in Bloemfontein and represented the at schoolboy level. He played for them as early as primary school level, at the Under-13 Craven Week in 2008. At high school level, he was twice selected to play for the Free State at the Under-18 Craven Week, the premier high school rugby union competition in South Africa, playing at the 2012 event in Port Elizabeth where he scored a try in their match against the and at the 2013 event in Polokwane, where he was utilised as a flanker and contributed a try in their defeat to the Pumas.
2014–present: Sharks / UKZN Impi
After high school, Louw moved to Durban to join the academy. He started the first three matches of the 's 2014 Under-19 Provincial Championship season as a flanker before moving into the backline in the centre position, where he played for the rest of the season. He started eleven of the team's twelve matches during the regular season, scoring tries in their matches against and as his team finished fourth on the log to secure the final semi-final spot. Louw also started the semi-final, but could not prevent his side losing the match 20–43 to the Blue Bulls. At the start of 2015, Louw played Varsity Shield rugby with. He started four of their eight matches during the regular season, scoring eight tries. He scored hat-tricks in matches against the and the and single tries against and, topping the try-scoring charts for his side and fourth overall in the competition. UKZN Impi finished in second spot on the log to qualify for the final, in which Louw started and helped his side to a 29–24 victory over Wits to win the title for the first time. Soon after the conclusion of the Varsity Shield, Louw was also drafted into the squad for the 2015 Vodacom Cup. He made his first class debut on 17 April 2015, coming on as a replacement for the Sharks XV in their 13–36 defeat to the in George. He was promoted to the starting lineup for his home debut against the a week later, scoring two tries in a 52–12 victory in Empangeni. Another try followed in his next match against in a 24–27 defeat and he started a third consecutive match a week later against the in the team's final match of the regular season. The team finished sixth on the Southern Section log, failing to qualify for the quarter finals. After coming on as a replacement in the s' second match of the Under-21 Provincial Championship season, he firmly established himself as the team's first-choice inside centre, starting ten of their remaining eleven matches in that position. He scored tries against, and, as his team finished third, before losing to Louw's hometown team in the semi-finals. Louw was named in the Super Rugby squad for the 2016 season, but didn't feature in any matches for the team. Instead, he continued his development with the UKZN Impi in the 2016 Varsity Shield, making seven appearances. He scored one try against and two against as his team won seven of their eight matches. UKZN Impi would have finished joint-top of the log with, but they had 12 points deducted for fielding an ineligible player, therefore missing out on the title play-offs and a shot at promotion to the Varsity Cup. Louw was again named in the squad – participating in the 2016 Currie Cup qualification series that effectively replaced the Vodacom Cup – and made six appearances. After an appearance off the bench against the, he made his first start of the season against Namibian side the in Umlazi, scoring the first hat trick of his senior career in a 48–18 victory. He made a further four starts for the team, scoring tries in matches against and as they finished in tenth place on the log. He was included in their squad for the 2016 Currie Cup Premier Division, but didn't feature for the team, instead making five starts for the in the 2016 Under-21 Provincial Championship. At the end of October 2016, he was included in the Super Rugby squad for the 2017 season.
