Is a non-compete clause enforceable in Thailand after resigning from a job?

The question concerns the enforceability of a non-compete clause in an employment contract after an employee has resigned from a position in Thailand. According to various comments, non-compete agreements are legally binding in Thailand, unlike in some other countries where they may be seen as unreasonable restraints of trade. Some commenters suggest that these clauses can be negotiated or waived and emphasize the importance of legal advice. The situation is complicated by the requirement for the employee to obtain a new work permit and comply with visa regulations, since her previous work permit would no longer be valid after leaving her job.