The present study was to explore the effects of sand-box play, how a child who has difficulty in stress-coping expresses his psychological status in the sand-box play and how the contents of his expression change in the process of play. For the purposes, following research questions were set up: 1. How does a child who has difficulty in stress-coping express his psychological status in the sand-box play? 2. How is the effect of sand-box play on a child who has difficulty in stress-coping? Participants were child and researcher. The subject was six-year-old male child. His teacher at the daycare center reported that he showed attention deficit and repetitive delinquent behavior such as rule transgressions, even though he knew the rules. He was also likely to avoid confronting conflicts and expressing his emotional expression. Especially, he had difficulty in coping with his own stress. The researcher was major in early childhood education in college and had 11 years of work experiences as an in-service teacher. She is in the process of learning developmental counseling in graduate school and completed the basic education. Also she has gotten supervision from a developmental expert and a sandplay expert. This study had been conducted in the sequence of the preparation of the sand-box tools, the administration of the sand-box play, the expression in the sand-box play, and the evaluation. The sand-box tools contain sand, a sand-box and play materials, which are followed by Kalff(1966). The sand-box play therapy was total 20 sessions from June 2012 to October 2012, in which 10 sessions(1st to 10th session) were implemented once a week, and the other 10 sessions(11th to 20th session) were implemented three times two weeks. The expression of sand-box play was analyzed by synthesizing the anecdotal documentations of children s behavioral characteristics in each session, photographs, videotape transcriptions and a child s self-evaluation of the play, focusing on the changing process of the play. Also, the evaluation of the sand-box play was focused on the changing process, which was analyzed on the aspect of psychological behavioral characteristics. The instruments used in this were study Korean Preschool Daily Stress Scale(KPDSS), Korean-Wechsler Intelligence Scale for Children-Ⅲ(K-WISC-Ⅲ), Bender-Gestalt Test(BGT), Kinetic Family Drawing(KFD), Self-Esteem Scale for young children, Self-Efficacy Inventory and Children`s Playfulness Rating Scale. The results of the study were as follows: First, When inspecting the expression of sand-box play, at the 1st session to the 5th session, the overall impression was rather poor, mechanical and routine. The sand-box was filled with play materials in disorder. He not only allocated the space but also utilized the whole space in the sand-box. In the case of the play theme, even though he had difficulty in setting the theme, the theme was usually fight, mother, father or younger sister. He often used vehicles as play materials, though, his play showed an inconsistent pattern, the lack of integrity and dynamics. His ego-development stage showed ‘The AnimalsㆍVegetative Phase’. At the 6th session to the 16th session, play contents were the disorder, the confusion, the confrontation and the struggle. In the use of the space, he utilized the whole sand-box space. Moreover, there was a change of being more dynamic play. The play themes was family, motorcycle, robot, car racing, Jeju-do, foreign country, zoo, museum, accident or storm. He often used vehicles as play materials, and the movement of the vehicles had consistent directions, dynamics. His ego-development stage showed ‘The Fighting Phase’. At the 17th session to the 20th session, play contents was being more constructive, disappearing the disorder, the confusion, the confrontation and the struggle. In the use of the space, he arranged the left and right sides in zigzags. Moreover, with drawing a circle from the interface, the ar