diff --git a/crates/ty_python_semantic/resources/mdtest/import/nonstandard_conventions.md b/crates/ty_python_semantic/resources/mdtest/import/nonstandard_conventions.md
index e17a026e32..3af8ec3a34 100644
--- a/crates/ty_python_semantic/resources/mdtest/import/nonstandard_conventions.md
+++ b/crates/ty_python_semantic/resources/mdtest/import/nonstandard_conventions.md
@@ -647,8 +647,8 @@ reveal_type(mypackage.imported.X)  # revealed: int
 
 ## `from` Import of Other Package's Submodule
 
-`from mypackage import submodule` from outside the package is not modeled as a side-effect on
-`mypackage`, even in the importing file (this could be changed!).
+`from mypackage import submodule` and `from mypackage.submodule import not_a_submodule` from outside
+the package are both modeled as a side-effects on `mypackage`.
 
 ### In Stub
 
@@ -663,18 +663,28 @@ reveal_type(mypackage.imported.X)  # revealed: int
 X: int = 42
 ```
 
+`package2/__init__.pyi`:
+
+```pyi
+```
+
+`package2/submodule.pyi`:
+
+```pyi
+not_a_submodule: int
+```
+
 `main.py`:
 
 ```py
 import mypackage
+import package2
 from mypackage import imported
+from package2.submodule import not_a_submodule
 
 reveal_type(imported.X)  # revealed: int
-
-# TODO: this would be nice to support, but it's dangerous with available_submodule_attributes
-# for details, see: https://github.com/astral-sh/ty/issues/1488
-# error: [possibly-missing-attribute] "Submodule `imported` may not be available"
-reveal_type(mypackage.imported.X)  # revealed: Unknown
+reveal_type(mypackage.imported.X)  # revealed: int
+reveal_type(package2.submodule.not_a_submodule)  # revealed: int
 ```
 
 ### In Non-Stub
@@ -690,17 +700,28 @@ reveal_type(mypackage.imported.X)  # revealed: Unknown
 X: int = 42
 ```
 
+`package2/__init__.py`:
+
+```py
+```
+
+`package2/submodule.py`:
+
+```py
+not_a_submodule: int
+```
+
 `main.py`:
 
 ```py
 import mypackage
+import package2
 from mypackage import imported
+from package2.submodule import not_a_submodule
 
 reveal_type(imported.X)  # revealed: int
-
-# TODO: this would be nice to support, as it works at runtime
-# error: [possibly-missing-attribute] "Submodule `imported` may not be available"
-reveal_type(mypackage.imported.X)  # revealed: Unknown
+reveal_type(mypackage.imported.X)  # revealed: int
+reveal_type(package2.submodule.not_a_submodule)  # revealed: int
 ```
 
 ## `from` Import of Sibling Module
diff --git a/crates/ty_python_semantic/src/semantic_index/builder.rs b/crates/ty_python_semantic/src/semantic_index/builder.rs
index ff1fbda5c1..62aeab245d 100644
--- a/crates/ty_python_semantic/src/semantic_index/builder.rs
+++ b/crates/ty_python_semantic/src/semantic_index/builder.rs
@@ -1556,6 +1556,16 @@ impl<'ast> Visitor<'ast> for SemanticIndexBuilder<'_, 'ast> {
                                     .entry(name)
                                     .or_insert(ImportKind::ImportFrom);
                             }
+                            for name in &node.names {
+                                let Some(relative_name) = ModuleName::new(&name.name) else {
+                                    continue;
+                                };
+                                let mut full_name = module_name.clone();
+                                full_name.extend(&relative_name);
+                                self.imported_modules
+                                    .entry(full_name)
+                                    .or_insert(ImportKind::ImportFrom);
+                            }
                         }
                     }
                 }