Thailand plans to end Covid quarantine requirements for fully vaccinated travellers from at least 10 low-risk nations from 1 November, officials say.
The 10 nations seen as low risk include the UK, China, Germany and the US.
The country has been recording more than 10,000 positive infections daily since July.
It has fully vaccinated around 33% of its almost 70 million people. Half the population has received one dose.
Prayuth said Thailand would also allow entertainment venues to reopen on 1 December and permit alcohol sales.
Referring to visitors from 10 low-risk nations, he stressed that "when they arrive, they should present a [negative] Covid test... and test once again upon arrival".
It is estimated that Thailand - popular for its sandy beaches and non-stop nightlife - lost about $50bn (£37bn) in tourism revenue in 2020.