What is the visa process for ordaining foreigner monks in Sri Lanka? I heard that the monk candidates outside of Sri Lanka have to make two trips to Sri Lanka in order to get an extended visa. I would prefer just making one trip to Sri Lanka(in the future) being enough to get an extended visa to be able to ordain as a monk. Is there a special way that don't require the foreigner monk candidates to make two trips to Sri Lanka? 

Note: I would like to ask the same question for the foreigner monk candidates in Thailand but I heard that they don't accept foreigners to be monk there anymore. If anyone has any informations about the foreigner monk situation in Thailand I would be glad If they inform me.
Previous discussion from Dhamma Wheel.

1) I have obtained a residency visa by this method in the past and it states it clearly in the NUA information:


After arriving in Sri Lanka with the entry visa, you can apply for the resident visa. You will be given a 30 day-visa on arrival, and the monastery will help you to apply for the resident visa. Visas for monks and nuns are free. Lay people need to pay for the application. (~Rs 20,000/USD200 per year).


In relation to the visa, understand that Sri Lanka is a Buddhist country and the religion carries great influence in the secular sphere as well, it is part of Sri Lankan nationalism, just as Hinduism is in India. Don’t worry about the visa, if you have a genuine intention to become a monk, then NUA will organise it. 

2) This, including the language barrier, has a disadvantage for foreigners, as they are regarded as outsiders and you will have to find your own way within the monastic system. You will be able to choose your own teacher and in many other ways will have to make your own decisions. The situation will not be a clear-cut training as you expect. It is not a training monastery (pirivena).

NUA APPROXIMATE TIMELINE TO BHIKKHU ORDINATION

1-4 months: Upāsaka (8 Precepts)
6-12 months Pabbajjā (going forth) and abiding as a Sāmaṇera (Novice monk) (10 Precepts and 75 Sekhiya rules) January – March: Vinaya Classes
April: Vinaya Exam
June: Upasampadā (higher ordination) at Galduwa Monastery

3) You should be familiar with the eight precepts and the history of Buddhism in Sri Lanka as custodian of the dhamma after it declined in India.

https://dhammawheel.com/viewtopic.php?t=30722