Change tourist visa to work visa: Requires sponsorship.

Yes, you can change your tourist visa (B-2) to a work visa (such as H-1B) while you are in the USA, but there are specific steps and requirements you must follow:

1. Job Offer: You must have a job offer from a U.S. employer willing to sponsor you for a work visa.

2. Petition: Your employer must file a petition (Form I-129) with U.S. Citizenship and Immigration Services (USCIS) on your behalf.

3. Approval: USCIS must approve the petition.

4. Status Change: You must apply to change your status from B-2 to the appropriate work visa status.

It's important to note that you cannot start working until your change of status is approved. Consulting with an immigration attorney is highly recommended to navigate the process smoothly and ensure compliance with all legal requirements.