diff --git a/rope/base/project.py b/rope/base/project.py
index 84ea237d..65417fa0 100644
--- a/rope/base/project.py
+++ b/rope/base/project.py
@@ -224,9 +224,22 @@ def __init__(
         super().__init__(fscommands)
         self.ignored = _ResourceMatcher()
         self.file_list = _FileListCacher(self)
+
+        extra_ignores = [
+            p.pathlib.relative_to(self.root.pathlib)
+            for p in self.get_python_path_folders()
+            if p.pathlib.is_relative_to(self.root.pathlib)
+            and "site-packages" in p.pathlib.parts
+        ]
+        for p in extra_ignores:
+            # I'm using this approach, because self.prefs.add after _init_prefs
+            # does not work for some reason.
+            prefs["ignored_resources"].append(str(p))
+
         self._init_prefs(prefs)
         if ropefolder is not None:
             self.prefs.add("ignored_resources", ropefolder)
+
         self._init_source_folders()
 
     def __repr__(self):
@@ -281,7 +294,7 @@ def _init_other_parts(self):
         # Forcing the creation of `self.pycore` to register observers
         self.pycore  # pylint: disable=pointless-statement
 
-    def is_ignored(self, resource):
+    def is_ignored(self, resource: Resource):
         return self.ignored.does_match(resource)
 
     def sync(self):
diff --git a/rope/base/resources.py b/rope/base/resources.py
index b284ba9f..199a5bc7 100644
--- a/rope/base/resources.py
+++ b/rope/base/resources.py
@@ -256,7 +256,7 @@ def _add_pattern(self, pattern):
         re_pattern = "^(.*/)?" + re_pattern + "(/.*)?$"
         self.compiled_patterns.append(re.compile(re_pattern))
 
-    def does_match(self, resource):
+    def does_match(self, resource: Resource):
         for pattern in self.compiled_patterns:
             if pattern.match(resource.path):
                 return True
diff --git a/rope/contrib/autoimport/utils.py b/rope/contrib/autoimport/utils.py
index a16efba0..e9929cfa 100644
--- a/rope/contrib/autoimport/utils.py
+++ b/rope/contrib/autoimport/utils.py
@@ -69,6 +69,14 @@ def get_modname_from_path(
     package_name: str = package_path.stem
     rel_path_parts = modpath.relative_to(package_path).parts
     modname = ""
+    try:
+        site_packages_index = rel_path_parts.index("site-packages")
+        raise RuntimeError("No site-packages allowed here.", modpath)
+    except ValueError:
+        pass
+    else:
+        # If path includes "site-packages", we're interested in part after this.
+        rel_path_parts = rel_path_parts[site_packages_index + 1:]
     if len(rel_path_parts) > 0:
         for part in rel_path_parts[:-1]:
             modname += part
diff --git a/ropetest/contrib/autoimport/utilstest.py b/ropetest/contrib/autoimport/utilstest.py
index 511e1a54..94c3e0a6 100644
--- a/ropetest/contrib/autoimport/utilstest.py
+++ b/ropetest/contrib/autoimport/utilstest.py
@@ -34,6 +34,13 @@ def test_get_modname_single_file(typing_path):
     assert utils.get_modname_from_path(typing_path, typing_path) == "typing"
 
 
+def test_get_modname_external(example_external_package_path):
+    assert utils.get_modname_from_path(
+        example_external_package_path,
+        example_external_package_path,
+    ) == "external_fixturepkg"
+
+
 def test_get_modname_folder(
     example_external_package_path,
     example_external_package_module_path,