Keep your language as simple as possible. Avoid using terms like “OPT,” “CPT,” and “STEM extension.” Begin by explaining that you have the legal right to work in the U.S. for twelve months (after your practical training [OPT] is authorized, of course, or you at least have a confirmation with receipt number), which requires absolutely no work on their part. If you are pursuing a STEM-related degree, you have an additional two years to work in the U.S. without needing an employer sponsorship. Then share that your work authorization can be renewed for another three to six years with an H-1B work visa. You may even want to think about avoiding the word "sponsor" when talking about the H-1B application process; instead use the phrase "petition."
Look at ways you can sell your international experience. How can being an international student be advantageous to an employer? If you have lived in multiple countries, think about how you have developed traits such as adaptability, resourcefulness, patience, independence and cultural sensitivity. Look for ways to emphasize these traits in your cover letter, resume and interview. These are all valuable soft skills that can elevate you above many other candidates. In addition, if the company has offices in your home country, it would be much easier for you to transfer there in the future. These are all great potential selling points that you can highlight throughout the application process.
For example, if you are a Computer Science student (a STEM program) and you are graduating in June 2020, you can simply say, “I do not need any kind of employment petition until June 2023 at the earliest.”