<?php
$entityTypeID = Mage::getModel('catalog/product')->getResource()->getTypeId();
$defaultAttributeSetId = Mage::getModel('catalog/product')->getDefaultAttributeSetId();
$model = Mage::getModel('eav/entity_attribute_set');
$model->setEntityTypeId($entityTypeID);
$model->setAttributeSetName($attributeSetName);
$model->validate();
$model->save();
$model
->initFromSkeleton($defaultAttributeSetId)
->save();
?>