Yes it's possible.
The template used for rendering the simple products in the grouped product page is:
`app/design/frontend/{package}/{theme}/template/catalog/product/view/type/grouped.phtml`
Inside it you will find this code:
<td><?php echo $this->escapeHtml($_item->getName()) ?></td>
You can change the code to:
<td>
<?php if ($_item->getVIsibility() != Mage_Catalog_Model_Product_Visibility::VISIBILITY_NOT_VISIBLE) : ?>
<a href="<?php echo $_item->getProductUrl()?>"><?php echo $_item->getName();?></a>
<?php else : ?>
<?php echo $_item->getName();?>
<?php endif;?>
</td>
I write code