Garciandia learned to play handball at SD Urola, a sports club in the two municipalities of Urretxu and Zumarraga in the Basque Country.

The left-hander joined first division club CB Ciudad de Logroño in 2015 via Sanlo EKT in Elgoibar,[1] with whom he finished runner-up in the Liga ASOBAL behind FC Barcelona in the 2015–16 season.

In the 2020–21 season, Garciandia played for the club Pays d'Aix in the French Starligue, where he scored 104 goals in 30 games.

[2] In the 2021–22 season, Garciandia signed a contract with the Hungarian first division club Pick Szeged.

Garciandia made his debut for the Spanish national team on 20 June 2018 against Poland.