In 2011, she participated for the first time in the Dakar Rally, winning the Female motorcycle category and finishing 39th overall, a position that she managed to repeat a year later.

The first contact with a motorbike came the same year, when her father used to seat her on the petrol tank of his bike and ride her around.

Laia's older brother, Joan, also a motorbike aficionado, had a Montesa Cota 25 cc.

In 1992, aged seven and encouraged by her mother, she participated in a race at the Catalan Junior Championship that was taking place in her village.

In 1998, she took part in the First Edition of the Women's Trial European Championship, unofficial at the time, and won.

She was only twelve years old and competing against more mature riders, attracting attention from fans and professional teams.

She also takes part as a member of the Spanish team in the first edition of the Female Trial Des Nations.

From then on she has collected many titles in female international competitions, winning the Women's Trial World Championship seven consecutive times (2000–2006 and 2021).

[8] In the 2016 edition of the Dakar Rally, Sanz raced for KTM and placed 15th in the motorbike general ranking.