Magento Product Attribute Sets installer script.

product_attribute_sets_installer.php

<?php
/**
 * Product Attribute Sets Installer
 */

/* @var $installer Mage_Catalog_Model_Resource_Setup */
$installer = $this;

// Default attribute set
$defaultAttributeSetId = $installer->getAttributeSetId(Mage_Catalog_Model_Product::ENTITY, 'Default');

// Entity type id
$entityTypeId = $installer->getEntityTypeId(Mage_Catalog_Model_Product::ENTITY);

// New attribute sets
$attributeSetsName = array(
    'New Attribute Set 1',
    'New Attribute Set 2'
);

foreach ($attributeSetsName as $attributeSetName) {
  
    $model  = Mage::getModel('eav/entity_attribute_set')->setEntityTypeId($entityTypeId);
    $model->setAttributeSetName($attributeSetName);

    try {
        if ($model->validate()) {
            $model->save();
            $model->initFromSkeleton($defaultAttributeSetId);
            $model->save();
        }
    } catch (Exception $e) {
        Mage::logException($e);
    }
}