diff --git a/.gitignore b/.gitignore
index a250469db..8b992dffc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -37,6 +37,8 @@ swiftest-*
 __pycache__*
 _cmake*
 _dependencies
+!SHTOOLS
+!SHTOOLS/**
 
 
 #Documentation
@@ -76,3 +78,5 @@ actions-runner*
 
 env/**
 venv/**
+
+sandbox/**
\ No newline at end of file
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 000000000..750c35aae
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "SHTOOLS"]
+	path = SHTOOLS
+	url = https://github.com/SHTOOLS/SHTOOLS
diff --git a/SHTOOLS b/SHTOOLS
new file mode 160000
index 000000000..aa6767f05
--- /dev/null
+++ b/SHTOOLS
@@ -0,0 +1 @@
+Subproject commit aa6767f0560e66c269473904eba978ef6e3713c2