Yes. We can change product attribute set programmatically.
I prefer to create massaction in catalog product grid to multiselect product and then select massaction for the products.
Creating massaction in grid.php
$sets = Mage::getResourceModel('eav/entity_attribute_set_collection')
->setEntityTypeFilter(Mage::getModel('catalog/product')->getResource()->getTypeId())
->load()
->toOptionHash();
$this->getMassactionBlock()->addItem('changeattributeset', array(
'label'=> Mage::helper('catalog')->__('Change attribute set'),
'url' => $block->getUrl('*/*/changeattributeset', array('_current'=>true)),
'additional' => array(
'visibility' => array(
'name' => 'attribute_set',
'type' => 'select',
'class' => 'required-entry',
'label' => Mage::helper('catalog')->__('Attribute Set'),
'values' => $sets
)
)
));
Creating controller action for change attribute sets of the selected products.
public function changeattributesetAction()
{
$productIds = $this->getRequest()->getParam('product');
$storeId = (int)$this->getRequest()->getParam('store', 0);
if (!is_array($productIds)) {
$this->_getSession()->addError($this->__('Please select product(s)'));
} else {
try {
foreach ($productIds as $productId) {
$product = Mage::getSingleton('catalog/product')
->unsetData()
->setStoreId($storeId)
->load($productId)
->setAttributeSetId($this->getRequest()->getParam('attribute_set'))
->setIsMassupdate(true)
->save();
}
Mage::dispatchEvent('catalog_product_massupdate_after', array('products'=>$productIds));
$this->_getSession()->addSuccess(
$this->__('Total of %d record(s) were successfully updated', count($productIds))
);
}
catch (Exception $e) {
$this->_getSession()->addException($e, $e->getMessage());
}
}
$this->_redirect('adminhtml/catalog_product/index/', array());
}