An assessment scale was developed to measure the competitiveness of wellness destinations in Thailand, particularly from the perspective of the wellness tourism firm. Several studies emphasized exploring the management of tourist attractions, the development of routes, and the promotion of products to wellness tourists. A number of studies concerning Thai spas and developing community wellness tourism explored quality development for businesses and communities and the types of wellness tourism in a particular area. However, there has been a lack of research regarding the development of a measurement scale for evaluating the competitiveness of wellness destinations, particularly among those that offer niche services, rather than a more general view; this would be especially useful for Thai destinations.