  We show that the stable module $\infty$-category of a finite group $G$
decomposes in three different ways as a limit of the stable module
$\infty$-categories of certain subgroups of $G$. Analogously to Dwyer's
terminology for homology decompositions, we call these the centraliser,
normaliser, and subgroup decompositions. We construct centraliser and
normaliser decompositions and extend the subgroup decomposition (constructed by
Mathew) to more collections of subgroups. The key step in the proof is
extending the stable module $\infty$-category to be defined for any $G$-space,
then showing that this extension only depends on the $S$-equivariant homotopy
type of a $G$-space. The methods used are not specific to the stable module
$\infty$-category, so may also be applicable in other settings where an
$\infty$-category depends functorially on $G$.
