  Two-dimensional electron gases (2DEGs) coupled to superconductors offer the
opportunity to explore a variety of quantum phenomena. These include the study
of novel Josephson effects, superconducting correlations in quantum (spin) Hall
systems, hybrid superconducting qubits and emergent topological states in
semiconductors with spin-orbit interaction (SOI). InSb is a well-known example
of such a strong SOI semiconductor, however hybrid superconducting devices in
InSb quantum wells remain unexplored. Here, we interface InSb 2DEGs with a
superconductor (NbTiN) to create Josephson junctions (JJs), thus providing the
first evidence of induced superconductivity in high quality InSb quantum wells.
The JJs support supercurrent transport over several microns and display clear
signatures of ballistic superconductivity. Furthermore, we exploit the large
Land\'{e} g-factor and gate tunability of the junctions to control the
current-phase relation, and drive transitions between the $0$ and $\pi$-states.
This control over the free energy landscape allows us to construct a phase
diagram identifying these $0$ and $\pi$-regions, in agreement with theory. Our
results establish InSb quantum wells as a promising new material platform to
study the interplay between superconductivity, SOI and magnetism.
