I tried to get a component form from my module. I got the model and then tried to get the form, but the result was empty. I tried to define 'JPATH_COMPONENT' and it was useless.
define('JPATH_COMPONENT', JPATH_SITE . '/components/com_business');
jimport('joomla.application.component.model');
JModelLegacy::addIncludePath(JPATH_SITE . '/components/com_business/models');
$model = JModelLegacy::getInstance('Organization', 'BusinessModel'); //It is correct
$form = $model ->get('Form'); //empty
print_r($form);
JPATH_COMPONENT
andJPATH_SITE
. You only need to useJPATH_SITE