Purpose: The purpose of this case study is to explore the principles and practices of sustainable development (SD) in the university curriculum. Design/methodology/approach: To explore the principles linked with the sustainable development goals (SDGs) and the learning and teaching practices in sustainability at the International University of Catalonia (Universitat Internacional de Catalunya, UIC, in Catalan), an empirical study was carried out by using a mixed methodology for data collection. Indicators related to SDGs found in the University curriculum (quantitative analysis) were measured using Excel, combined with in-depth semi-structured interviews to the deans of different faculties (qualitative study), which were analysed using "Atlas.ti." Findings: Several visions, difficulties and challenges were identified in this mixed-method study around the concept of sustainability, which allowed the authors to describe and portray a specific starting position in relation to the SDGs at the UIC. Research limitations/implications: The presence of dimensions linked to the SDGs in the University curriculum were analysed by means of a quantitative study. However, global competences related to education for sustainable development were not studied. Practical implications: Special emphasis was given to the challenges and opportunities for training future graduates and the whole University community in SD. Originality/value: This paper shows a methodological exploration of the principles related to the SDGs and the learning and teaching practices in sustainability in higher education