Gambling and sports are entangled in a close relationship. However, little remains known about gambling behaviors and perceptions in sports. Drawing on normalization theory, this study explores the prevalence and predictors of problem gambling as well as the normalization of gambling (including its availability and accessibility, prevalence, and socio-cultural accommodation) in sports clubs. A cross-sectional study design was implemented, based on an online survey completed by 817 Belgian sports club actors. This survey consisted of the Problem Gambling Severity Index (PGSI) and questions about personal and socio-cultural factors regarding gambling. Data were analyzed with SPSS 26 software, using descriptive statistics and an ordinal logistic regression analysis. These analyses exposed being male, being aged 26–35 years old, and being involved in football (soccer) as factors that might be linked with higher levels of problem gambling in sports. Furthermore, sports betting is especially shown to be normalized in sports clubs given its prevalence, and its frequently organized and discussed character. Moreover, respondents disclosed a lack of formal rules (96%) and education initiatives (98.7%) on gambling in their sports club. Given the indicated support for gambling regulations and educational measures, this study may inform sports organizations about how to help denormalize gambling.