This study was to investigate the internal world of a girl in an elementary school who complained of stomachache and headache with enuresis through sandplay therapy. Fifty-six sessions were conducted. In the initial phase of therapy (1st-5th sessions, deficiency, seeking femininity), the client expressed a mermaid, a bird that was confined and birds which could not fly and the absence of mother. During the intermediate phase of therapy (6th-52nd sessions, death, centering), she expressed the death of parents and a baby death who died by head hurt in the intermediate phase I (6th-9th sessions, death I). She had a rule concept and showed a marrying bride in the intermediate phase II (10th-20th sessions, rule I, small unity). She expressed centering in the intermediate phase III (21st-37th sessions, centering, rule II, conflict, death II). She showed the celebration of one-year-old baby, the death of various family members and the death of a mother in the intermediate phase IV(38th-52nd sessions, the birth of a baby, death III). In the final phase of therapy (53rd-56th sessions, unity, finding treasure), she obtained mature femininity at an appropriate age level and found a treasure. In a real life, somatization symptoms were disappeared and she began to express her real feelings without repression. These results demonstate that the sandplay therapy was useful for the client because somatization symptoms were faded away.