Hi boliviano,
I didn't know the component 'tortags' (until now), but as far as I see from the description in the JED, this component adds tags to an article via a plugin. Since Sitelinkx also uses a plugin to replace keywords, you could try to change the order in which plugins are executed, so that the Sitelinkx plugin replaces keywords before the tortags plugin adds the tags to the article.
Another solution could be to disable content plugins in the tortags component, but this requires a corresponding option in the tortags configuration. Unfortunately I don't know the tortags component good enough to tell if there exists such a configuration setting.
If this also doesn't help, you can try to use the { sitelinkxoff } tag in your tortags component, this should normally prevent Sitelinkx from replacing keywords.
maike