Clinical placements are an important part of health students’ training. Whilst much value is placed on the clinical environment as a place to learn, there is a paucity of direct evidence about its effectiveness. The aim of this study was to compare the competence, importance, and interest in cardiorespiratory physiotherapy of students before and after one month of clinical practice. A pre- and post-placement questionnaire about students’ interest in different physiotherapy subspecialties was used. The students with a cardiorespiratory clinical placement showed a significant change in their perception about the importance of the cardiorespiratory specialty (0.348 ± 1.01; p < 0.001), while no significant change was observed in the students without cardiorespiratory placement (−0.014 ± 0.825; p = 0.883). The presence or absence of clinical placements seems to have a definitive impact on students’ choice of a specialty. This implies the need for developing a set of clinical placements in all the subareas of physiotherapy in order to give undergraduate students the opportunity to make a better decision.