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Some academies that conduct tantra sessions for their patients also have the facility and authority to certify individuals with this skill set. You just need to look for such courses that are available online and apply for them. Starting from the basics to the mastery of all beginner-level techniques, you will learn them all.
The next best way to become a tantra teacher is to volunteer in one of the top academies and be part of their journey. Be part of the entire crew, and while you stay with them, you will eventually learn how to conduct a tantra session.
If you are not new to tantra and have attended several workshops and basic training courses in the past, then you are a step closer to becoming a tantra teacher. All you have to do is take the advanced course from any renowned academy, and you will own the certification of a professional tantra teacher.
Most online tantra training courses are only theoretical, whereas you need practical sessions. In theory classes, you will be taught about mantras, sutras, lineages, sexual education, and yantras. But when you enter the practical sessions, your lessons will be upgraded with meditation practices, energy transmutation, and other such training.
To become a fully certified tantra teacher, you need to obtain a high-level program and excel in it to be part of the tantra crew. But, if you have no idea where to start, or are unable to understand which course is the best for you, then the best way out is to take an open internship.