This study verified a structural equation model under which adult attachment anxiety reached sexual addiction through self-compassion for South Korea adult. A survey was conducted on adult male and female aged between 18 and 74 living in the South Korea. Only those who voluntarily agreed to the study using the online survey method performed the final 1,623 questionnaires. Attachment anxiety, a subfactor of adult attachment(ECR-R), Korean-version self-compassion(K-SCS), and the online sexual addiction scale domestically developed with validity were used as study measurement. Final investigated data were analyzed by M-Plus 6.12. SEM was verified and bootstrapping was used in order to confirm mediating effect of self-compassion on the relationships between adult attachment anxiety and sexual addiction. The results of this study were as follows. First, the results of the research all showed significant relationships between affirmative factors (self-kindness, common humanity, and mindfulness) and negative factors (self-judgment, isolation, and over-identification) of attachment anxiety and self-compassion. Second, the negative factors of self-compassion showed significant positive relationships with sexual addiction. Third, the affirmative factors of self-compassion showed significant positive relationships with sub-factors of sexual addiction (sexual imagination and imitation impulse). Forth, attachment anxiety showed significant positive relationships with sexual addiction. Conclusionally, all the path coefficients were significant except the path to sexual addiction out of the affirmative factors of self-compassion.