If you are planning to stay in Thailand for short periods of time, you can get a tourist visa which is pretty much simple to obtain. Please contact the Thai Embassy in your country for more details. If you are planning to stay for longer periods of time, there are three alternative choices for you.
If you invest THB 10 million or higher in Thailand– which you can use to buy real estate with – then you are qualified for an Investor Visa. This allows you to stay for a period of one year and can be renewed every year.
If you are aged 50 or over and invest THB 850,000 or more in the country – which you can use to buy real estate with – then you are qualified for a Retirement Visa. This allows you to stay for a period of one year and can be renewed every year.
If you don’t have those qualifications for either of the options above, it is possible to apply for an Education Visa. This will cost around $1,000 per year and can be renewed.