$optionCollection = $product->getTypeInstance()->getOptionsCollection();
$selectionCollection =$product->getTypeInstance()->getSelectionsCollection($product->getTypeInstance()->getOptionsIds());
$options = $optionCollection->appendSelections($selectionCollection);
foreach( $options as $option )
{
$_selections = $option->getSelections();
foreach( $_selections as $selection )
{
$product_simple = Mage::getModel('catalog/product')->load($selection->getId());
}
}
Надеюсь, это сработает для вас.:)
Удачи.