A shapefile (.shp) is a vector data storage format for storing the location, shape, and attributes of geographic features. A shapefile is stored in a set of related files and contains one feature class.
A layer file (.lyr) is a file that stores the path to a source dataset and other layer properties, including symbology.
In comparison to a shapefile, a layer file is a just a link\reference to actual data, such as a shapefile, feature class, etc. It is not actual data because it does not store the data's attributes or geometry. A layer file primarily stores the symbology for a feature and other layer properties related to what is seen when the data is viewed in a GIS application.
For example, if a layer file is sent to a user on another machine without the data it was created from, it does not display on the map because it does not contain the source data. To get the data to display properly, the user must have the layer file and the shapefile it references.
This is where utilizing layer packages eases the processing of migrating data, because layer packages store both the layer file and source data. For more information about layer packages, see the Web help topic. (http://support.esri.com/es/knowledgebase/techarticles/detail/40057)
Basically your layer is already a shapefile.
I used qml to convert Corine vector data style to mapbox style. Qml style doesn't work for raster style.
npx geostyler -t mapbox -o corine_AllClass.mapbox - s qml corine_AllClass.qml
Best Answer
If SLD is declared you can get layer parameters with parsing XML.
In ArcGIS you need add a local feature class and load it as feature layer. Next, identifying type of symbology of your layer in SLD and next generate symbols with appropriate type in ArcGIS. Finally save your symbology to LYR.
I don't know if this script is dev... I find lot of subject for convert LYR to SLD but no reverse.
You can do a script for this conversion with arcpy and xml packages in Python environment if you want. I think lot of persons are interested in.