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Purpose: This study evaluated the effects of a hospital-based hand hygiene campaign conducted by nursing students on participants' infection control awareness and behavioral intention to change, and explored students' development of health education competencies through experiential learning. Methods: A convergent mixed methods design was used. The qualitative data were collected from 105 campaign participants (70.5% female) through evaluations of campaign content, operation, knowledge and awareness change, and behavioral intention using 5-point Likert scales. The data were obtained from semi-structured focus group interviews with 12 nursing students who conducted the campaign and analyzed using thematic analysis. Findings were integrated through joint display analysis. Results: Participants reported high satisfaction across all evaluation items (scores≥4.0) and demonstrated strong behavioral intention to practice handwashing more frequently (4.54±0.64). Older adults aged ≥70 years showed relatively lower comprehension scores (4.29) compared to younger age groups, indicating the need for age-tailored educational strategies. Nursing students demonstrated significant growth in patient-centered communication, intergenerational communication, and practical problem-solving abilities. Integrated findings revealed alignment between students' communication strategies and participants' evaluations and highlighted the educational value of experiential learning in authentic settings. Conclusion: Hospital-based hand hygiene campaigns effectively enhance participants' infection control awareness and behavioral intentions while strengthening nursing students' competencies and professional identity as future health educators. Expanding field-based learning opportunities may support competency development essential for imparting effective school and community health education.