The special alignment of the principles and effects of the social economy (SE) with the Sustainable Development Goals (SDGs) renders this area especially suitable for the implementation of the 2030 Agenda and the achievement of these goals, favoring a paradigm shift towards a new economic system that reconciles growth and sustainability. In this context, governments and institutions can moderate or accelerate this path, with the implementation of a series of policies to promote and drive the social economy. In Spain, responsibility for the design and implementation of such policies is transferred to sub-central governments, known as autonomous communities. Galicia is the first Spanish autonomous community to have its own Act on SE. This article explains the promotion strategy established in this region, which has resulted in an ecosystem favorable to the development and consolidation of the Galician SE, based on a combination of public policies with synergistic effects. The outcome of this ecosystem could have a significant impact on the achievement of several of the Sustainable Development Goals (SDGs), especially the promotion of equal opportunities (SDG 5), the promotion of decent work and economic growth (SDG 8), and the reduction of inequalities (SDG 10).