Harnaaz Sandhu Won titles such as Miss Chandigarh 2017 and Miss Max Emerging Star India 2018.
In 2019, Harnaz won the title of Femina Miss India Punjab 2019, the same year she competed in Femina Miss India, where she finally made it to the top 12
On 16 August 2021, Harnaaz Sandhu was shortlisted as one of the top 50 semifinalists of Miss Diva 2021
On 23 August 2021, Harnaaz was confirmed as one of the Top 20 finalists that would compete in the televised Miss Diva competition 2021
Harnaaz Sandhu won the Miss Beautiful Skin award and became a finalist for Miss Beach Body, Miss Beautiful Smile, Miss Photogenic, and Miss Talented
As a winner of Miss Diva 2021, Harnaaz Sandhu received the right to represent India at Miss Universe 2021.
Harnaaz Sandhu won the Miss Universe 2021 on 13 December 2021 in Eilat, Israel, and became the third Indian woman to win the crown.