This link to a Covid information site for travelers to France published by the French government was posted in another thread recently and may be helpful for you:
French people who are living abroad, travelling or returning from abroad, as well as visitors from abroad, will find answers below to frequently (…)
www.diplomatie.gouv.fr
As
@C clearly said, it all depends what country you're coming from. Check to see if the country you're coming from falls into the "green" or "orange" category and proceed from there. Buen Camino!
Edit: I see that you posted that you were coming from Thailand as I was posting this reponse. As you said, it's an "orange" country - which means that as of March 22 you must provide proof of your booster shot as well as a "sworn statement" (presumably given at your arrival to France) attesting that you are free from Covid symptoms and have not come into contact with anyone exhibiting them.
The above site explicitly states that "No test is required to travel to mainland France from a country classified on the orange list for vaccinated travellers." So if you're vaxxed and boosted, I don't think you need to worry about getting tested immediately before your trip unless of course you are symptomatic or have reason to believe you have been in contact with someone who is.