Hi Shanur Rahman,
The competition for physics which is held at International level for Undergraduate students is "The University Physics Contest". In this competitions, students are divided in teams of 3 members each in their respective colleges. They spend a weekend in November and analyze real world scenario using the principles of physics with a written formal paper.
The registrations for the same has been opened on 1st September 2020. The contest will be held on 6th to 8th November 2020. the papers must be submitted within 48 hours/2 days through an email, Registrations should be done by the faculty of your college on the official website of University Physics Contest.
For more information, you can go through their official website.