Volunteers are human resources which are very critical to sports organizations (Chelladurai,1999). SEA Games, Asian Games and Olympic Games are all international games which need a large number of volunteers (Green & Chalip, 1998). However, Thailand which has been the host for several international games has still no standard model for volunteers management according to human resource management. This study aimed to develop a model for sport volunteers management in international games held in Thailand. The research samples consisted of 4 experts in sport volunteers management in international games held in Thailand who were purposively selected and 410 volunteers and stakeholders in sport organizations who were simply randomly selected. The tools were a form of structured interview and a set of questionnaire whereas data were analyzed in terms of frequency, percentage, arithmetic mean (X), standard deviation (S.D.), and Exploratory Factor Analysis (EFA). The results indicated as follows: A model for sport volunteers management in international games held in Thailand contains the following phases: 1) Preparing Phase: planning of the overall game, identifying the number and types of volunteers; 2) Implementing Phase: application & recruitment of volunteers , Orientation & training, operational management, volunteer evaluation and retention; 3) Networking Phase: network creation, development and sustainable retention of the networks. In addition, factors encouraging the sport volunteers management in international games held in Thailand are motivational factors in 3 phases: pre-event motivations, on-site-event motivations, and post-event motivations.